Dynamic Learning Rate in Deep CNN Model for Metastasis Detection and Classification of Histopathology Images.

Diagnosis of different breast cancer stages using histopathology whole slide images (WSI) is the gold standard in determining the grade of tissue metastasis. Computer-aided diagnosis (CAD) assists medical experts as a second opinion tool in early detection to prevent further proliferation. The field of pathology has advanced so rapidly that it is possible to obtain high-quality images from glass slides. Patches from the region of interest in histopathology images are extracted and trained using artificial neural network models. The trained model primarily analyzes and predicts the histology images for the benign or malignant class to which it belongs. Classification of medical images focuses on the training of models with layers of abstraction to distinguish between these two classes with less false-positive rates. The learning rate is the crucial hyperparameter used during the training of deep convolutional neural networks (DCNN) to improve model accuracy. This work emphasizes the relevance of the dynamic learning rate than the fixed learning rate during the training of networks. The dynamic learning rate varies with preset conditions between the lower and upper boundaries and repeats at different iterations. The performance of the model thus improves and attains comparatively high accuracy with fewer iterations.

Histomorphological analysis of gastric polyps.

INTRODUCTION: Incidence of gastric carcinoma and gastric polyps is on rise all over the world. Chronic atrophic gastritis to intestinal metaplasia progressing to adenocarcinoma has been documented pathway for gastric carcinogenesis. Another pathway for gastric carcinoma is adenoma carcinoma sequence similar to colon cancer. AIM: To study prevalence, endoscopic, and histomorphological features of gastric polyps. METHODS AND MATERIAL: This was retrospective analysis of gastric polyps from 2012 to 2019 in consecutive 10,800 upper gastrointestinal endoscopies. Demographic, endoscopic, and histopathological data were obtained from hospital records. All gastric polyps were classified as per standard histologic criteria. Additional histological features noted were presence of dysplasia, focus of adenoma, or malignancy. RESULTS: The prevalence of gastric polyps was 434 (4%) of 10,800 upper gastrointestinal endoscopies. Majority of polyps were found in the last 4 years (277: 63.8%). Mean age was 55.4 years with male to female ratio 1:1.2. Most of the polyps (94.9%) were less than 1 cm, located in gastric antrum. Multiple polyps were seen in 20.9% cases. On histopathology, fundic gland polyps were most common (147: 33.8%), followed by hyperplastic (128: 29.4%) polyps. Adenomatous polyps were nine (2%); of these, two cases of hyperplastic polyps and one each of fundic gland polyp and benign epithelial polyp showed adenomatous foci. CONCLUSION: Fundic gland polyps were the most common polyps. With rising incidence of gastric carcinoma, identification of gastric polyps on endoscopy with biopsy can prevent progression to carcinogenesis.

Evaluating the optimum number of biopsies to assess histological inflammation in ulcerative colitis: a retrospective cohort study.

BACKGROUND: The optimal ulcerative colitis biopsy protocol is unclear. AIM: To evaluate the number of biopsies required to accurately assess microscopic disease activity in ulcerative colitis METHODS: Biopsies from patients with ≥4 rectosigmoid samples, and clinical and endoscopic data, were retrospectively obtained from a prospective biobank. Histology and endoscopic videos were read blindly. A 4-biopsy Robarts Histopathology Index (RHI) reference score, consisting of the worst item-level ratings from four biopsies, was compared to 1-, 2- and 3-biopsy estimates. Agreement was determined using bivariate errors-in-variable regression analysis (acceptance interval: ±8.25). Endoscopic activity and disease location subgroup analyses were also performed. RESULTS: Forty-six patients had ≥4 rectosigmoid biopsies available (N = 287). The 2-biopsy (tolerance interval: -7.66, 4.79) and 3-biopsy (tolerance interval: -4.86, 3.46) RHI scores demonstrated acceptable agreement with 4-biopsy scores. One-biopsy scores demonstrated unacceptable agreement (tolerance interval: -13.99, 7.78). Mean RHI scores using the 2-, 3- and 4-biopsy approaches were similar (6.1 ± 9.6 P = 0.36; 6.8 ± 10.5, P = 0.7; 7.5 ± 11.2), whereas the 1-biopsy estimate was lower (4.4 ± 8.1, P = 0.06). Histological remission rates were identical for the 2-, 3- and 4-biopsy methods (65.2%, P = 1.0). Subgroup analysis demonstrated that three biopsies were required in patients with endoscopically active disease. Sampling additional colonic locations yielded lower histological remission rates compared to rectosigmoid sampling alone (33.3% vs 61.9%, P = 0.1). CONCLUSIONS: A minimum of two - conservatively, three - biopsies are required to reliably assess disease activity in a single colonic segment using the RHI. Further studies are needed of endoscopically active patients and sampling locations. These results have implications for biopsy strategies in clinical trials and practice.

A semi-automated method for unbiased alveolar morphometry: Validation in a bronchopulmonary dysplasia model.

Reproducible and unbiased methods to quantify alveolar structure are important for research on many lung diseases. However, manually estimating alveolar structure through stereology is time consuming and inter-observer variability is high. The objective of this work was to develop and validate a fast, reproducible and accurate (semi-)automatic alternative. A FIJI-macro was designed that automatically segments lung images to binary masks, and counts the number of test points falling on tissue and the number of intersections of the air-tissue interface with a set of test lines. Manual selection remains necessary for the recognition of non-parenchymal tissue and alveolar exudates. Volume density of alveolar septa ([Formula: see text]) and mean linear intercept of the airspaces (Lm) as measured by the macro were compared to theoretical values for 11 artificial test images and to manually counted values for 17 lungs slides using linear regression and Bland-Altman plots. Inter-observer agreement between 3 observers, measuring 8 lungs both manually and automatically, was assessed using intraclass correlation coefficients (ICC). [Formula: see text] and Lm measured by the macro closely approached theoretical values for artificial test images (R2 of 0.9750 and 0.9573 and bias of 0.34% and 8.7%). The macro data in lungs were slightly higher for [Formula: see text] and slightly lower for Lm in comparison to manually counted values (R2 of 0.8262 and 0.8288 and bias of -6.0% and 12.1%). Visually, semi-automatic segmentation was accurate. Most importantly, manually counted [Formula: see text] and Lm had only moderate to good inter-observer agreement (ICC 0.859 and 0.643), but agreements were excellent for semi-automatically counted values (ICC 0.956 and 0.900). This semi-automatic method provides accurate and highly reproducible alveolar morphometry results. Future efforts should focus on refining methods for automatic detection of non-parenchymal tissue or exudates, and for assessment of lung structure on 3D reconstructions of lungs scanned with microCT.

Role Of Fine Needle Aspiration Cytology In Diagnosis Of Palpable Breast Lesions And Their Comparison With Histopathology.

BACKGROUND: The aim of this study was to compare the diagnostic utility of fine needle aspiration cytology (FNAC) in breast lesion with gold standard of histopathological diagnosis. METHODS: This descriptive cross-sectional study was conducted in Pathology department of Bannu Medical College in collaboration with Surgery Department of Khalifa Gul Nawaz Teaching Hospital Bannu as well as other private surgical hospitals of the territory. A total of 88 FNAC of palpable breast lesions were performed and compared with their corresponding histopathological reports. Patients age, location of lesion in breast, and other necessary findings were recorded on predesigned proforma, FNAC performed by using 10 ml syringes. Slides prepared and processed for cytological staining and reported by cytopathologist. Corresponding biopsies were processed for histopathological examination and diagnosis. All female patients of any age with breast lesions were included, and those breast lesions for which no histopathological report was available were excluded. Statistical Package for Social Sciences (SPSS) version 20 was used for calculation of frequencies with percentages and mean with standard deviation. Also, specificity, sensitivity, diagnostic accuracy, positive predictive value and negative predictive value were calculated by using formulas. RESULTS: In this study the mean age was 34.44±21.57 years and age range was from 16 to 80 years. The most common age group was 26-35 years followed by 36-45 years. In this study sensitivity was (83.33%), specificity was (100 %), positive predictive value was (100 %), negative predictive value was (99.27%) and diagnostic accuracy was 99.30%. CONCLUSIONS: FNAC breast is an easily approachable, less invasive, cheap, rapid and almost accurate diagnostic tool in the diagnosis of palpable as well as non palpable breast lesions.

Factors associated with use of immunohistochemical markers in the histopathological diagnosis of cutaneous melanocytic lesions.

BACKGROUND: Melanocytic tumors are often challenging and constitute almost one in four skin biopsies. Immunohistochemical (IHC) studies may assist diagnosis; however, indications for their use are not standardized. METHODS: A test set of 240 skin biopsies of melanocytic tumors was examined by 187 pathologists from 10 US states, interpreting 48 cases in Phase I and either 36 or 48 cases in Phase II. Participant and diagnosis characteristics were compared between those who reported they would have ordered, or who would have not ordered IHC on individual cases. Intraobserver analysis examined consistency in the intent to order when pathologists interpreted the same cases on two occasions. RESULTS: Of 187 participants interpreting 48 cases each, 21 (11%) did not request IHC tests for any case, 85 (45%) requested testing for 1 to 6 cases, and 81 (43%) requested testing for ≥6 cases. Of 240 cases, 229 had at least one participant requesting testing. Only 2 out of 240 cases had more than 50% of participants requesting testing. Increased utilization of testing was associated with younger age of pathologist, board-certification in dermatopathology, low confidence in diagnosis, and lesions in intermediate MPATH-Dx classes 2 to 4. The median intraobserver concordance for requesting tests among 72 participants interpreting the same 48 cases in Phases I and II was 81% (IQR 73%-90%) and the median Kappa statistic was 0.20 (IQR 0.00, 0.39). CONCLUSION: Substantial variability exists among pathologists in utilizing IHC.

National society for histotechnology workload study.

The National Society for Histotechnology (NSH) Quality Management Committee conducted a Workload Study in response to numerous requests by NSH society members for current information examining productivity and staffing in the clinical histology laboratory. Data collection was conducted between October 11 and 9 November 2018 of 15,848 individuals with deliverable email addresses taken from the NSH database (3.6% net email bounce rate). Survey productivity questions were segmented into key areas including grossing, embedding, microtomy and ancillary duties. From the responses, comparisons of laboratory demographics and productivity were examined by institution type and size. This report presents the data collected from the NSH Workload Study.

A Randomized Controlled Trial on Optimal Sampling Sequence in Radial Guide Sheath Endobronchial Ultrasound Lung Biopsy.

BACKGROUND: An optimal sampling sequence in radial guide sheath endobronchial ultrasound lung biopsy (R-EBUS) is unclear. This prospective single-center pilot randomized controlled trial aimed to determine if the initial method and sequence of sampling affect the diagnostic accuracy of the procedure. METHODS: Consecutive patients undergoing R-EBUS for lesions >15 mm with a bronchus sign were randomly assigned (1:1:1) to biopsy first (group A), brushings first (group B) or combination (group C). The primary outcome was a positive diagnosis from any sampling method. RESULTS: Fifty-four patients were randomized. The overall diagnostic yield of the procedure was 77.8% (95% confidence interval: 66%-89%), with no difference between groups. A higher rate of positive cytology from brushings was seen if the biopsies were performed before brushings (77.8% in group A vs. 44.4% in group B, P=0.03). The rate of positive cytology from washings was higher if the washings were obtained just after the brushings (61.1% in group A vs. 11.1% in group B, P=0.02). There was no difference in the rate of positive biopsy histology in the groups (P=0.27). All 3 sampling modalities were more likely to be positive in group A (50.0% vs. 11.1% in group B and 22.2% in group C, P=0.04). Complications rate was low and not significantly different between groups. CONCLUSION: The overall rate of a positive R-EBUS procedure was not affected by the initial sampling method or sequence. However, all 3 sampling modalities were more likely to be positive if biopsies were performed first, followed by brushings and washings.

Terminal digit preference: a source of measurement error in breast cancer diameter reporting.

Objectives: Women diagnosed with breast cancer are offered treatment and therapy based on tumor characteristics, including tumor diameter. There is scarce knowledge whether tumor diameter is accurately reported, or whether it is unconsciously rounded to the nearest half-centimeter (terminal digit preference). This study aimed to assess the precision (number of digits) of breast cancer tumor diameters and whether they are affected by terminal digit preference. Furthermore, we aimed to assess the agreement between mammographic and histopathologic tumor diameter measurements.Material and Methods: This national registry study included reported mammographic and registered histopathologic tumor diameter information from the Cancer Registry of Norway for invasive breast cancers diagnosed during 2012-2016. Terminal digit preference was assessed using histograms. Agreement between mammographic and histopathologic measurements was assessed using the intraclass correlation coefficient (ICC) and Bland-Altman plots.Results: Mammographic, histopathologic, or both tumor measurements were available for 7792, 13,541 and 6865 cases, respectively. All mammographic and 97.2% of histopathologic tumor diameters were recorded using whole mm. Terminal digits of zero or five were observed among 38.7% and 34.8% of mammographic and histopathologic measurements, respectively. There was moderate agreement between the two measurement methods (ICC = 0.52, 95% CI: 0.50-0.53). On average, mammographic measurements were 1.26 mm larger (95% limits of agreement: -22.29-24.73) than histopathologic measurements. This difference increased with increasing tumor size.Conclusion: Terminal digit preference was evident among breast cancer tumor diameters in this nationwide study. Further studies are needed to investigate the potential extent of under-staging and under-treatment resulting from this measurement error.

Comparison of line-field confocal optical coherence tomography images with histological sections: Validation of a new method for in vivo and non-invasive quantification of superficial dermis thickness.

BACKGROUND: Line-field confocal optical coherence tomography (LC-OCT) is an imaging technique providing "optical biopsies" of the skin in real time and non-invasively. At a center optical wavelength of 1.3 µm, this innovative technology can be applied to dermo-cosmetic product development due to both high image resolution (~2 µm) and sufficient penetration (~0.5 mm). Nevertheless, the precise dermal area analyzed with LC-OCT has never been identified. In this study, the objective was to compare LC-OCT images with histological sections of the same area, in order to validate a new method for in vivo and non-invasive quantification of superficial dermis thickness. Once validated, this standardized and quantitative method was used to assess age-related changes of the superficial dermis. MATERIALS AND METHODS: Ex vivo LC-OCT acquisitions and hematoxylin-eosin-safran staining were performed on a panel of four healthy Caucasian female volunteers. In vivo LC-OCT study of skin aging was performed on a panel of 37 healthy Caucasian female divided into five different age-groups. RESULTS: Comparison with histological sections revealed that LC-OCT images allow the visualization and the quantification of the superficial portion of papillary dermis. Applied to different age-group of volunteers, LC-OCT images show a constant decrease in this superficial dermis thickness with age. CONCLUSIONS: In conclusion, we have introduced LC-OCT as a novel technique for in vivo and non-invasive evaluation of superficial dermis thickness. This approach could be used in the future to demonstrate visually and quantitatively the capacity of a dermo-cosmetic active ingredient to renormalize the structural properties of the dermis.

Clinical, Endoscopic, and Histologic Findings at the Distal Esophagus and Stomach Before and Late (10.5 Years) After Laparoscopic Sleeve Gastrectomy: Results of a Prospective Study with 93% Follow-Up.

OBJECTIVE: Perform a prospective study based on sequential clinical, endoscopic, and histologic evaluations of the foregut late after laparoscopic sleeve gastrectomy (LSG) in obese patients. After LSG, several studies have suggested an increase in the incidence of clinical gastroesophageal reflux (GERD) while others have reported an improvement but based mainly on clinical questionnaires. METHODS: Prospective study of 104 consecutive patients submitted to LSG. Several postoperative endoscopic and histologic evaluations of the esophagogastric junction (EGJ) and the gastric tube (GT) were performed and correlated with symptomatic findings. RESULTS: According to clinical preoperative findings, patients were divided into non-refluxers (Group I) and refluxers (Group II). Seven patients were unreachable, leaving 97 (93%) for late evaluation. Among Group I, 58.5% developed de novo GERD, while in Group II just 13.6% showed the disappearance of them. Endoscopic evaluations showed progressive deterioration of the EGJ in Group I, with the development of erosive esophagitis (EE), hiatal hernia (HH), and dilated cardia in a large proportion of them. In the GT, the presence of bile was seen in 40%, and an open immobile pylorus was detected in 82%. Short-segment Barrett's esophagus (BE) appeared in 4%. CONCLUSIONS: Patients submitted to LSG showed a significant and progressive increase in the presence of "de novo" GERD. Also, an increased duodenogastric reflux was seen through an open and immobile pylorus. Therefore, based on these results, it seems like LSG is a "pro-reflux" surgical procedure, which should be continuously evaluated late after surgery.

Aplicación de la inmunocitoquímica como ayuda diagnóstica: experiencia en hospital universitario de alta complejidad en Cali, Colombia / Application of immunocytochemistry as a diagnostic aid: Experience in a tertiary university hospital in Cali, Colombia

Introducción: La inmunocitoquímica es de gran utilidad para la diferenciación de lesiones benignas y malignas mediante la utilización de anticuerpos específicos que diferencian las células según su origen. Este estudio se realizó con el fin de describir la experiencia de la Fundación Valle del Lili en la aplicación de la inmunohistoquímica al estudio citológico de diferentes tipos de muestra. Materiales y métodos: Se realizó un estudio observacional, descriptivo y retrospectivo de las citologías registradas en la base de datos del departamento de patología de la Fundación Valle del Lili entre diciembre de 2015 y octubre de 2017. Resultados: Se analizaron 54 citologías a las que se efectuó estudio inmunocitoquímico. Se logró realizar tanto bloque celular como botón de citología en base líquida en el 38,88% (n=21) del total de muestras, encontrándose entre los resultados de ambos tipos de citología un coeficiente kappa de Cohen de 0,80 (IC95%: 0,46-1,0), p<0,001. Los marcadores más empleados fueron: Calretinina, MOC-31, EMA, TTF1, PAX8 y calcitonina. De las citologías positivas para malignidad, se realizó diagnóstico definitivo con biopsia al 58,1% (n=25), encontrándose una concordancia muy alta, con un coeficiente kappa de Cohen de 1,0 (IC95%: 1,0-1,0), p<0,001. Discusión: La información aportada por este estudio permite implementar la citología de botón en base líquida para la realización de inmunocitoquímica en los marcadores que fueron evaluables y en los que se encontró concordancia con respecto a la citología en bloque celular. Además, invita a continuar en la búsqueda de conocimiento aportando datos a futuros estudios en esta línea de investigación

Introduction: Immunocytochemistry is very useful in the differentiation of benign and malignant lesions, through the use of specific antibodies that differentiate the cells according to their origin. This study aims to describe the application of immunohistochemistry to the cytological study of different sample types at the Valle del Lili Foundation. Materials and methods: A descriptive, retrospective, observational study was carried out with cytologies registered in the database of the pathology department of the Fundación Valle del Lili, between December 2015 and October 2017. Results: Fifty-four cytological samples with immunocytochemistry were included. It was possible to perform both the cell block and the liquid-based cytology button to 38.88% (n=21) of the total samples, finding from the results of both types of cytology, a Cohen's Kappa coefficient of 0.80 (95%CI: (0.4-1.0), P<.001. The most commonly used markers were: Calretinin, MOC-31, EMA, TTF1, PAX8, and Calcitonin. Out of the cytological studies positive for malignancy, a definitive diagnosis was made with a biopsy in 58.1% (n=25), with a Cohen's Kappa coefficient of 1.0 (95%CI: 1.0-1.0), P<.001. Discussion: This study provided data that permits the implementation of liquid-based cytology button for immunocytochemical studies, using assessable markers with agreement with cell-block cytology. Furthermore, it provides data useful for future research in this field

Impact of pre-analytical variables on deep learning accuracy in histopathology.

AIMS: Machine learning (ML) binary classification in diagnostic histopathology is an area of intense investigation. Several assumptions, including training image quality/format and the number of training images required, appear to be similar in many studies irrespective of the paucity of supporting evidence. We empirically compared training image file type, training set size, and two common convolutional neural networks (CNNs) using transfer learning (ResNet50 and SqueezeNet). METHODS AND RESULTS: Thirty haematoxylin and eosin (H&E)-stained slides with carcinoma or normal tissue from three tissue types (breast, colon, and prostate) were photographed, generating 3000 partially overlapping images (1000 per tissue type). These lossless Portable Networks Graphics (PNGs) images were converted to lossy Joint Photographic Experts Group (JPG) images. Tissue type-specific binary classification ML models were developed by the use of all PNG or JPG images, and repeated with a subset of 500, 200, 100, 50, 30 and 10 images. Eleven models were generated for each tissue type, at each quantity of training images, for each file type, and for each CNN, resulting in 924 models. Internal accuracies and generalisation accuracies were compared. There was no meaningful significant difference in accuracies between PNG and JPG models. Models trained with more images did not invariably perform better. ResNet50 typically outperformed SqueezeNet. Models were generalisable within a tissue type but not across tissue types. CONCLUSIONS: Lossy JPG images were not inferior to lossless PNG images in our models. Large numbers of unique H&E-stained slides were not required for training optimal ML models. This reinforces the need for an evidence-based approach to best practices for histopathological ML.

Correlation Between Endoscopic and Histological Activity in Ulcerative Colitis Using Validated Indices.

BACKGROUND AND AIMS: Endoscopy and histopathology are pivotal for evaluating disease activity in ulcerative colitis [UC]; correlation between validated endoscopic and histological indices has not been examined. We aim to correlate the Ulcerative Colitis Endoscopic Index of Severity [UCEIS] with two new validated histological indices in patients with established UC. METHODS: This was a single-centre cohort of patients with established UC, who underwent flexible sigmoidoscopy or colonoscopy by a single endoscopist. The UCEIS was scored at the worst affected area in the distal colon, which was biopsied; histological disease activity using Nancy [NI] and Robarts' Histological [RHI] indices was scored by a pathologist blinded to the endoscopy. Spearman correlation between the UCEIS, NI, and RHI, and between NI and RHI, was performed. RESULTS: A total of 125 patients, median age 37 years [range 16-81 years], with UCEIS scores [scale 0-8]: 0, n = 21; 1-3, n = 48; 4-6, n = 51; and 7-8, n = 5, were included. Correlation coefficients between UCEIS and NI [scale 0-4] were r = 0.84 (95% confidence interval [CI] 0.76-0.89, p < 0.001) and between UCEIS and RHI [scale 0-33] r = 0.86 [95% CI 0.80-0.90, p < 0.001]. The difference in correlation was not significant [p = 0.57]. There was excellent correlation between the two histological indices [r = 0.92, 95% CI 0.87-0.95, p < 0.001]. Quiescent disease activity defined as the absence of neutrophils [Nancy 0-1, Robarts 0-3] was most closely correlated with UCEIS = 0. CONCLUSIONS: The UCEIS strongly correlates with both NI and RHI. Complete mucosal healing is best defined as a UCEIS = 0/8, since this correlates with the absence of microscopic disease activity.

Reducing Unnecessary Imaging and Pathology Tests: A Systematic Review.

CONTEXT: Unnecessary imaging and pathology procedures represent low-value care and can harm children and the health care system. OBJECTIVE: To perform a systematic review of interventions designed to reduce unnecessary pediatric imaging and pathology testing. DATA SOURCES: We searched Medline, Embase, Cinahl, PubMed, Cochrane Library, and gray literature. STUDY SELECTION: Studies we included were: reports of interventions to reduce unnecessary imaging and pathology testing in pediatric populations; from developed countries; written in the English language; and published between January 1, 1996, and April 29, 2017. DATA EXTRACTION: Two researchers independently extracted data and assessed study quality using a Cochrane group risk of bias tool. Level of evidence was graded using the Oxford Centre for Evidence-Based Medicine grading system. RESULTS: We found 64 articles including 44 before-after, 14 interrupted time series, and 1 randomized controlled trial. More effective interventions were (1) multifaceted, with 3 components (mean relative reduction = 45.0%; SD = 28.3%) as opposed to 2 components (32.0% [30.3%]); or 1 component (28.6%, [34.9%]); (2) targeted toward families and clinicians compared with clinicians only (61.9% [34.3%] vs 30.0% [32.0%], respectively); and (3) targeted toward imaging (41.8% [38.4%]) or pathology testing only (48.8% [20.9%]), compared with both simultaneously (21.6% [29.2%]). LIMITATIONS: The studies we included were limited to the English language. CONCLUSIONS: Promising interventions include audit and feedback, system-based changes, and education. Future researchers should move beyond before-after designs to rigorously evaluate interventions. A relatively novel approach will be to include both clinicians and the families they manage in such interventions.

Osificación heterotópica de cicatriz de laparotomía / Heterotopic ossification in laparotomy scar

Se presenta el caso de un paciente masculino de 54 años de edad operado en dos ocasiones por adenocarcinoma gástrico, a quien se le encontró una masa ósea de la cicatriz de la línea media abdominal que fue resecada. El análisis histológico confirmó una formación ósea madura. Este hallazgo llama la atención sobre la formación ósea en las cicatrices quirúrgicas. Debe hacerse diagnóstico diferencial con recidivas metastásicas de la cicatriz quirúrgica de aparición posterior a cirugía abdominal por cáncer. Se analizó la patogenia según la literatura especializada. El objetivo del trabajo fue presentar una entidad poco frecuente y revisar las teorías etiopatogénicas actuales de esta condición morbosa(AU)

A case is reported of a 54-year-old male patient operated twice for gastric adenocarcinoma, who was found to have a bone mass of the midline abdominal scar that was removed. Histological analysis confirmed mature bone formation. This finding draws attention to bone formation in surgical scars. Differential diagnosis should be made with metastatic relapses of the surgical scar that appears after abdominal surgery for cancer. Pathogenesis was analyzed according to the specialized literature. The objective of this study was to present a rare entity and to review current etiopathogenic theories of this morbid condition(AU)

Stain Deconvolution Using Statistical Analysis of Multi-Resolution Stain Colour Representation.

Stain colour estimation is a prominent factor of the analysis pipeline in most of histology image processing algorithms. Providing a reliable and efficient stain colour deconvolution approach is fundamental for robust algorithm. In this paper, we propose a novel method for stain colour deconvolution of histology images. This approach statistically analyses the multi-resolutional representation of the image to separate the independent observations out of the correlated ones. We then estimate the stain mixing matrix using filtered uncorrelated data. We conducted an extensive set of experiments to compare the proposed method to the recent state of the art methods and demonstrate the robustness of this approach using three different datasets of scanned slides, prepared in different labs using different scanners.

Microscope use in clinical veterinary practice and potential implications for veterinary school curricula.

Microscopy (skill of using a microscope) and the concepts of cytology (study of cells) and histology (study of tissues) are most often taught in professional veterinary medicine programs through the traditional method of glass slides and light microscopes. Several limiting factors in veterinary training programs are encouraging educators to explore innovative options for teaching microscopy skills and the concepts of cytology and histology. An anonymous online survey was administered through the Colorado Veterinary Medical Association to Colorado veterinarians working in private practice. It was designed to assess their current usage of microscopes for cytological and histological evaluation of specimens and their perceptions of microscope use in their veterinary education. The first part of the survey was answered by 183 veterinarians, with 104 indicating they had an onsite diagnostic lab. Analysis pertaining to the use of the microscope in practice and in veterinary programs was conducted on this subset. Most respondents felt the amount of time spent in the curriculum using a microscope was just right for basic microscope use and using the microscope for viewing and learning about normal and abnormal histological sections and clinical cytology. Participants felt more emphasis could be placed on clinical and diagnostic cytology. Study results suggest that practicing veterinarians frequently use microscopes for a wide variety of cytological diagnostics. However, only two respondents indicated they prepared samples for histological evaluation. Veterinary schools should consider these results against the backdrop of pressure to implement innovative teaching techniques to meet the changing needs of the profession.

Histologic analysis of the hernia sac: current practices based on a survey of IPEG members.

INTRODUCTION: Inguinal hernia repair is one of the most common operations performed by pediatric surgeons. Although the practice of sending the hernia sac for histologic examination after routine hernia repair is common, the indications and practice patterns for this have not been evaluated. The objective of this survey was to determine practice patterns and indications for histologic analysis of the pediatric inguinal hernia sac. MATERIALS AND METHODS: A 9-question online survey was sent to all members of the International Pediatric Endosurgery Group (IPEG). A Kruskal-Wallis test was used to determine whether practice patterns of sending the hernia sac for histologic evaluation were associated with respondent characteristics. The chi-squared test with Yates's correction was used where appropriate. RESULTS: The survey was completed by 315 IPEG members, for a response rate of 54.4%. Hernia sacs were sent for histologic evaluation always by 23.9%, often by 5.1%, rarely by 17.5%, and never by 53.5%. The respondent characteristics were not associated with whether or not specimens were sent for histology review. Of the 128 who reported sending the inguinal hernia sac, the most common reasons were hospital/state requirements (47.6%), followed by routine practice (25.7%) and concern for missed pathology (24.2%). CONCLUSIONS: The majority of IPEG respondents report never sending the inguinal hernia sac for histologic analysis. Of those that do, most are influenced by hospital/state requirements. The value of sending the hernia sac after routine inguinal hernia repair should be validated if it is to remain an institutional requirement.