Artificial neural network analysis for evaluating cancer risk in multinodular goiter.

BACKGROUND: The aim of this study was to create a diagnostic model using the artificial neural networks (ANNs) to predict malignancy in multinodular goiter patients with an indeterminate cytology. MATERIALS AND METHODS: Out of 623 patients, 411 evaluated for multinodular goiter between July 2004 and March 2010 had a fine-needle aspiration biopsy. All patients underwent total thyroidectomy. The interpretation was consistent with an indeterminate lesion in 116 (18.6%) patients. Patient's medical records including age, sex, dominant nodule size, pre-operative serum thyroid-stimulating hormone level, thyroid hormone therapy and final pathologic diagnosis were collected retrospectively. RESULTS: The mean age of the patients was 44.6 years (range, 17-78 years). About 104 (89.7%) were female and 12 (10.3%) were male patients. Final pathology revealed 24 malignant diseases (20.7%) and 92 (79.3%) benign diseases. After the completion of training, the ANN model was able to predict diagnosis of malignancy with a high degree of accuracy. The area under the curve of ANNs was 0.824. CONCLUSION: The ANNs technique is a useful aid in diagnosing malignancy and may help reduce unnecessary thyroidectomies in multinodular goiter patients with an indeterminate cytology. Further studies are needed to construct the optimal diagnostic model and to apply it in the clinical practice.

Serum chitotriosidase activity in acute appendicitis: preliminary results.

Chitotriosidase is one of the most quantitative proteins secreted by activated macrophages, so its activity has been proposed as a biochemical marker of macrophage accumulation. The clinical importance of the chitotriosidase is still largely unknown. Our aim was to evaluate diagnostic accuracy of serum chitotriosidase activity in acute appendicitis (AA). A total of 34 patients with preoperative AA diagnosis (18 men and 16 women; mean age, 28.8±10.9 years) were enrolled in this study. The appendix specimens were classified as normal appendix (10 patients) and AA (24 patients). The serum chitotriosidase activity was measured preoperatively. Diagnostic value of the preoperative chitotriosidase activity as assessed through the corresponding receiver operating characteristic curve was well (area under the curve, 0.771; 95% confidence interval, 0.647-0.877; P<.05). Preoperative serum chitotriosidase activity may be a useful marker for diagnosis of AA, and future studies are required to confirm the results presented here.

Efficacy of Thiol Disulfide Homeostasis and Ischemia Modified Albumin Values in Estimating the Degree of Difficulty for Laparoscopic Cholecystectomy.

AIM: The aim of this study was to investigate the efficacy of thiol disulfide homeostasis and Ischemia Modified Albumin (IMA) values in predicting the technical difficulties that might be encountered during laparoscopic cholecystectomy. MATERIALS AND METHODS: The study included 65 patients who underwent laparoscopic cholecystectomy due to cholelithiasis at the General Surgery Clinic of Ankara Numune Training and Research Hospital. All patients' demographic data, previous history of cholecystitis, a history of chronic illness, preoperative white blood count (WBC), liver function tests (AST, ALT), amylase and lipase levels, intra-operative adhesion score, the ultrasonographic appearance of gall bladder, duration of hospital stay, duration of operation, thiol disulfide and IMA values were evaluated. RESULTS: Native thiol and total thiol averages were higher in patients without a history of cholecystitis, and on the other hand, disulfide, disulfide/native thiol rate, disulfide/total thiol rate, native thiol/total thiol rate and IMA averages were higher in patients with a history of cholecystitis. While there was a statistically significant negative correlation between native and total thiol values and age, duration of surgery and duration of hospital stay; IMA, disulfide, disulfide/Total thiol, Native/Total thiol and disulfide/Native thiol rates were higher in older patients with a longer duration of surgery and hospital stay. In addition, preoperative IMA, disulfide, disulfide/Total thiol, Native/Total thiol and disulfide/Native thiol were observed to increase as the degree of intraoperative pericholecystic adhesion increased. CONCLUSION: We believe that the evaluation of thiol disulfide homeostasis and IMA parameters prior to laparoscopic cholecystectomy can be used as an effective method for predicting intraoperative difficulties.

Management of Bile Duct Injuries: A 6-year Experience in a High Volume Referral Center.

OBJECTIVES: The aim of our study was to determine operative and nonoperative treatments performed in bile duct injuries and the effect of a multidisciplinary approach on the treatment. BACKGROUND: Bile duct injuries may lead to morbidities such as biliary leakage, peritonitis, and mortality. MATERIALS AND METHODS: A total of 83 patients with biliary complications (37 patients with iatrogenic bile duct injury referred to our clinic from other centers were also included in this study) were evaluated. RESULTS: Of the operated 6,663 patients, iatrogenic bile duct injury occurred in 46 (0.69%) of these patients. The most common type of injury was Strasberg type A injury, which was found in 48 (57.83%) patients. The time interval between the diagnosis and initiation of treatment after the operation was shorter in patients with an inserted cavity drainage catheter (p < 0.05). Of the patients with bile duct injury, 32.6% received surgical and 62.6% endoscopic treatment, while 4.8% were followed-up without intervention. The rate of mortality was found to be 2.4%. CONCLUSION: Time interval to diagnosis is of great importance for management of the patients. HOW TO CITE THIS ARTICLE: Çavusoglu SD, Doganay M, Birben B, et al. Management of Bile Duct Injuries: A 6-year Experience in a High Volume Referral Center. Euroasian J Hepato-Gastroenterol 2020;10(1):22-26.

Peritoneal hydatidosis with ileus.

BACKGROUND: The parasitic infection hydatidosis or echinococcosis, is a parasitic infection caused most frequently by flatworm Echinococcus granulosus. Hydatidosis is endemic in Turkey where animal husbandry is common. Eventhough, Hydatid disease can develop anywhere in the human body it is most frequently occurs in the liver and then the lungs. Rupture of hydatid cysts into the peritoneal cavity, although rare, still presents a challenge for the surgeon. CASE: A 20-year-old man presented with ileus after 24 hours of mild abdominal distention, pain and nausea. On examination his abdomen was tender, with guarding and rebound tenderness and had a 3 cm long subcostal incision scar. All laboratory investigations were in the normal range. Exploratory laparotomy revealed multiple peritoneal cyst hydatid lesions with the largest measuring 10 cm in size and one also located in the right lobe of the liver. CONCLUSIONS: Rupture of hydatid cysts into the peritoneal cavity, although rare, still presents a challenge for the surgeon. This pathology should be included in the differential diagnosis of acute abdomen in endemic areas, especially in patients with a history of cyst hydatid (Fig. 1, Ref. 12). Full Text (Free, PDF) www.bmj.sk.

Receiver operating characteristic analysis of leukocyte counts in operations for suspected appendicitis.

STUDY OBJECTIVE: There has been no clear-cut value of the white blood cell (WBC) count in differential diagnosis of acute appendicitis in emergency medicine. Therefore, the aim of this study was to assess the preoperative WBC counts in 3 groups of patients operated on for a clinical suspicion of acute appendicitis with different findings at appendectomy: uninflamed appendix, uncomplicated acute appendicitis, or complicated acute appendicitis. METHODS: The medical records of 540 patients who underwent appendectomy for suspected acute appendicitis during a 17-month period were retrospectively reviewed. Data for 3 groups of patients were analyzed to calculate the sensitivity and specificity of the WBC count in the diagnosis of acute appendicitis, and we calculated likelihood ratios for 2 cut-points with either high sensitivity or high specificity. Receiver operating characteristic curves were used to evaluate the WBC count in relation to the true diagnosis and severity of acute appendicitis. RESULTS: We were able to identify patients with appendicitis on a statistically significant level using receiver operating characteristic curves of WBC counts (area under the curve = 0.756, P < .001), but the WBC count had no diagnostic value in differentiating between uncomplicated and complicated groups (area under the curve = 0.55, P = .086). Likelihood ratio ranged from 1.79 (95% confidence interval, 1.17-2.3) for WBC count of more than 10,500 cells/mm(3) to 3.20 (95% confidence interval, 2.72-3.24) for WBC count of more than 14,300 cells/mm(3). CONCLUSION: White blood cell count is helpful in the diagnosis and exclusion of appendicitis. However, there is no value to differentiate advanced appendicitis.

A prospective randomized trial comparing the harmonic scalpel with conventional knot tying in thyroidectomy.

Currently, thyroidectomies are performed with very little morbidity. This study was undertaken to investigate whether the use of the harmonic scalpel during thyroid surgery has any advantage over the conventional technique. Eighty patients were randomly assigned to 2 groups. The patients in group 1 (n=40) underwent thyroidectomy performed with conventional knot tying and the electrocautery technique; in patients in group 2 (n=40), the harmonic scalpel was used for the procedure. Significant differences were observed between these 2 surgical techniques in terms of operative time, number of ligatures used, amount of bleeding, average length of incision, total amount of drainage fluid, and cosmetic satisfaction (P<.05). With the harmonic scalpel technique, there was a nearly 18% reduction in operative time. No significant differences were noted between mean hospital stay and postoperative pain (P>.05). No patient in either group had permanent recurrent laryngeal nerve palsy or hypoparathyroidism. The harmonic scalpel significantly shortens the duration of thyroidectomies; it can be used safely and effectively in thyroid surgery with no additional morbidity.

Does technique alter quality of life after pilonidal sinus surgery?

BACKGROUND: Pilonidal sinus is a common disease in young adults that carries high postoperative morbidity and patient discomfort. Controversy still exists about the best surgical technique for the treatment of the disease in terms of recurrence rate and patient discomfort. METHODS: From January 2000 to November 2003, 100 consecutive age- and sex-matched patients with chronic pilonidal sinus disease were randomized to receive surgical treatment in the forms of either excision and primary closure or rhomboid excision and Limberg flap. Time to return to work and to complete healing were recorded. To evaluate quality of life and patient comfort, all patients were asked to complete a questionnaire including short form 36, Visual Analogue Scale, time to sitting on toilet without pain, and time to walking without pain 3 months after surgery. RESULTS: Each group was composed of 50 patients. Mean follow-up was 19 months. There was a significant difference between the groups in terms of length of hospital stay (P=.005), time to complete healing (P<.001), time off work (P<.001), and wound infection rate (P=.03). Statistically significant differences were noted between the groups in items of general health perception (71.1+/-11.7 vs 78.2+/-14.1; P=.008), social functioning (87.3+/-32.8 vs 110.4+/-33.8; P=.001), and pain (54.5+/-14.0 vs 67.5+/-18.4; P<.001). Times to sitting on toilet and walking without pain showed significant differences between the groups (P=.006 and P<.001, respectively). The mean postoperative Visual Analogue Scale scores were 6.5+or= 1.7 and 7.4+/- 1.4, respectively (P<.001). CONCLUSIONS: Shorter hospital stay, earlier healing, shorter time off work, lower ratio of complications, lower pain perception, and improved general health perception are the main advantages of te Limberg flap technique in pilonidal sinus surgery. All together, these parameters add to patient comfort and satisfaction after surgical treatment.

Evaluation of P-POSSUM and O-POSSUM scores in patients with gastric cancer undergoing resection.

BACKGROUND/AIMS: The aim of this study was to evaluate the predictive accuracy of P-POSSUM and O-POSSUM models on patients undergoing elective gastric resection. METHODOLOGY: P-POSSUM and O-POSSUM predictor equations for mortality were applied retrospectively to 126 patients who had undergone elective gastrectomy for cancer. Observed mortality rates were compared with rates predicted by P-POSSUM and O-POSSUM using the Hosmer-Lemeshow goodness-of-fit test. Evaluation of the discriminative capability of both models was performed using receiver-operating characteristic (ROC) curve analysis. RESULTS: Overall fourteen deaths were observed. O-POSSUM predicted 15 deaths (chi2=14.61, p=0.13) and P-POSSUM predicted 20 deaths (chi2=25.41, p=0.002) using the Hosmer-Lemeshow test. ROC curves analysis revealed that O-POSSUM had better discriminatory power for mortality compared to P-POSSUM (area under curve=0.880, for O-POSSUM and area under curve=0.703 for P-POSSUM). CONCLUSIONS: These data suggest that O-POSSUM predicts mortality more accurately than P-POSSUM in patients undergoing elective gastrectomy for cancer.

External metallic circle in hepaticojejunostomy.

BACKGROUND: Biliary-enteric anastomosis especially Roux-en Y hepaticojejunostomy is frequently used for biliary diversion in benign biliary strictures. In this study, we present the results of hepaticojejunostomy with external metallic circle. METHODS: Hepaticojejunostomy with external metallic circle were performed in eight male Sprague-Dawley rats. At the end of the third month, anastomoses were analysed for patency and stability of external circles. RESULTS: Relaparotomy revealed that all the anastomoses were patent and circles were in original places. CONCLUSION: To provide the patency of narrow hepaticojejunostomy anastomoses, external metallic circle can be a good alternative to use of internal stents in suitable cases.

Primary echinococcal cyst of the thyroid: report of a case.

A case of primary hydatid disease of the thyroid, a rare location, is presented. The patient was a 50-year-old woman who presented with a neck mass at the thyroid region, which was noticed 2 months before her presentation. Although the clinical impression was of a neoplastic lesion (adenoma or carcinoma), a hydatid cyst was considered intraoperatively and confirmed by a frozen section histology. It was completely removed. No other sites of hydatid disease were found and the patient remained well postoperatively. In patients with a solitary cyst in the thyroid, the possibility of hydatid disease, though rare, should be always kept in mind, because a needle aspiration biopsy is a potentially harmful procedure.

Bilateral ductal carcinoma in situ of the breast after radiation therapy for Ewing's sarcoma of the vertebra in a young woman: report of a case.

Thoracic radiation in the early years of life is a known risk factor for breast cancer later in life. A 21-year-old woman who had received thoracic radiation therapy for Ewing's sarcoma of the vertebra 9 years earlier was referred to our hospital for investigation of a palpable mass in her left breast. Ultrasonography and excisional biopsy showed ductal carcinoma in situ (DCIS) of the left breast, with no detectable pathology in the right breast except that it was more hypoplastic than the left breast. Considering the known risk factors for invasive breast cancer in both breasts, we performed bilateral skin-sparing mastectomy with immediate breast reconstruction using subpectoral implants. The final histopathological diagnosis was bilateral DCIS.

Can biliary-cyst communication be predicted before surgery for hepatic hydatid disease: does size matter?

BACKGROUND: The aim of this study was to determine if there is any predictive factor indicating the risk of bile leakage before surgery for hepatic hydatid disease in clinically asymptomatic patients. METHODS: The data of 116 patients who underwent surgery for hepatic hydatid disease were reviewed retrospectively. There were 43 men (37%) and 73 women (63%) with a mean age of 45 +/- 15 years. Because of high preoperative serum bilirubin and liver function test levels, 12 patients were excluded from the study. These patients underwent preoperative endoscopic retrograde cholangiopancreatography. In addition, 2 medically treated patients were excluded from the study. The following variables were analyzed as potential predictors of biliary-cyst communication: age, sex, physical examination findings, leukocyte count, liver function test results, and ultrasonographic cyst features (type, diameter, number, and localization). RESULTS: Bile leakage was detected in 24 out of 102 patients. There were no differences in age, sex, cyst type, alkaline phosphatase level, gamma-glutamyl transpeptidase level, alanine aminotransferase level, aspartate aminotransferase level, bilirubin level, and number of cysts and cyst locations between the patients with and without bile leakage. The mean cyst size in patients with biliary leakage was 10.2 cm as compared with 6.1 cm in patients with no biliary leakage (P < .05). When the cut-off value of cyst diameter was accepted as 7.5 cm, the specificity and sensitivity for biliary-cyst communication were 73% and 79%, respectively. CONCLUSIONS: These data suggest that cyst diameter is an independent factor that is associated with a high risk of biliary-cyst communication in clinically asymptomatic patients. Preoperative endoscopic retrograde cholangiopancreatography should be performed in these asymptomatic patients to reduce the incidence of postoperative complications.

Serum endostatin levels and regenerative capacities of normal and cirrhotic livers following partial hepatectomy in mice: the response to different resection sizes.

BACKGROUND: Angiogenesis has an important role in liver regeneration. Antiangiogenic response in remnant liver following resection and its relationship to regeneration is not well known. The aim of this study was to investigate the effect of hepatectomy size on serum endostatin levels, and the effect of endostatin levels to liver regeneration after partial hepatectomy in normal and cirrhotic mice. MATERIALS AND METHODS: Sixty noncirrhotic and 36 carbon tetrachloride-induced cirrhotic mice were included in the study. Noncirrhotic mice were randomly divided into four main groups: sham, 20%, 40%, and 70% hepatectomy groups. Similarly, cirrhotic mice were randomly divided into three main groups: sham, 20%, and 40% hepatectomy groups. The mice in each group were further divided into two subgroups to compare serum endostatin levels and liver regeneration indexes on days 1 and 14. Liver regeneration was evaluated by the proliferating cell nuclear antigen-labeling index. Serum endostatin level was measured to evaluate antiangiogenic response. RESULTS: Serum endostatin levels on the first day and 14th day increased significantly in correlation with the hepatectomy size, both in normal mice and cirrhotic mice (P < 0.05). In normal mice with high regeneration indexes that underwent 40% and 70% hepatectomies, there was a significant increase in serum endostatin levels on the 14th day compared with the first day (P < 0.05). However, the increase in mice that underwent 20% hepatectomies was not significant. After 20% and 40% hepatectomies, first day serum endostatin levels were significantly higher in cirrhotic mice compared with normal mice (P < 0.05), which was independent of regeneration. Nevertheless, after 40% hepatectomies, 14th day serum endostatin levels were significantly lower in cirrhotic mice compared with normal mice, attributable to the limited regeneration capacity of cirrhotic liver (P < 0.05). Regeneration capacity of cirrhotic liver was low at all times. CONCLUSIONS: The current study suggests that there is a significant relationship between serum endostatin levels and regeneration capacity after hepatectomy in normal mice. On the other hand, following resection of cirrhotic liver, regeneration capacity is depressed and high endostatin levels are independent of hepatic regeneration.

Recovery of sexual function after scrotal hernia repair.

BACKGROUND: Most of the patients with scrotal hernia have sexual dysfunction to some extent. Therefore, we investigated the recovery of sexual function after scrotal hernia repair by using an internationally approved, patient-administered questionnaire. METHODS: In a prospective follow-up study, 34 patients with scrotal hernia were investigated to assess sexual function before and 3 months after hernia repair by using the International Index of Erectile Function (IIEF) questionnaire. The mean scores obtained on pre- and postoperative visits for all domains of sexual function were analyzed and compared with the Wilcoxon test. Hernia repair was performed by using a standardized Lichtenstein technique. RESULTS: The total mean score of the IIEF-15 was 52.08 before surgery and 56.20 after the procedure, with this difference considered statistically significant (P < .001). Eighty-five percent of the patients improved their scores versus 9% and 6% who showed worsening or no change at all in IIEF scores after surgery, respectively. All of the 5 sexual function domains except the orgasm domain presented statistically significant improvement. CONCLUSIONS: This study showed that scrotal hernia repair caused a positive impact on sexual function after surgery. There was no case of surgery-related erectile dysfunction. Therefore, one of the major indications to repair large scrotal hernias may be to improve the quality of sexual life.

Re-evaluation of axillary skip metastases in the era of sentinel lymph node biopsy in breast cancer.

PURPOSE: To investigate whether skip axillary metastases are really skip metastases or a continuation of level I micrometastases in invasive breast cancer, and to determine whether there are any factors predisposing to skip metastases. METHODS: We reviewed 568 consecutive patients with breast cancer who underwent complete axillary lymph node dissections (ALND) between January 1998 and December 2004. For patients with skip axillary lymph node metastases, resectioning and immunohistochemical staining of the remaining part of paraffin blocks from level I lymph nodes were done to determine whether there were any micrometastases in this group of lymph nodes. RESULTS: Skip axillary metastases were found in 27 (10%) of 268 patients with axillary lymph node metastases. Re-evaluation of the level I lymph nodes, both with thin sectioning and immunohistochemical staining, in the patients with axillary skip metastases revealed no micrometastases. No significant correlation was found between the demographic and histopathological variables of the patients with skip metastases and those with regular axillary metastases. CONCLUSIONS: These results suggest that skip axillary metastases are actual skip metastases, not a continuation of undetected level I micrometastases. Moreover, none of the clinical and histopathological measures of primary tumors are predictors of the presence of skip metastases.

Value of preoperative serum CA 19-9 levels in predicting resectability for pancreatic cancer.

BACKGROUND: Pancreatic cancer carries a poor prognosis; at operation approximately 25% of patients will be found to have unresectable tumours even though CT has demonstrated that they are resectable. At our tertiary care centre, we wished to find out if there is an optimum cut-off value for the CA 19-9 level preoperatively that will indicate that the pancreatic cancer is unresectable despite radiologic imaging that suggests otherwise according to receiver operating characteristic (ROC) curve analysis. METHODS: Preoperative demographic data, clinical features and serum CA 19-9 levels were reviewed for 51 patients with pancreatic cancer who underwent laparotomy between 1998 and 2003. Preoperatively, resectability was determined from a complete history, physical examination and radiologic imaging. An ROC curve was constructed for the CA 19-9 levels. The sensitivity, specificity, positive and negative predictive values of CA 19-9 were calculated with several cut-off points. RESULTS: There were 18 (36%) resectable and 33 (64%) unresectable pancreatic cancers. The mean CA 19-9 level was 68.8 U/mL in the resectable group and 622 U/mL in unresectable group. When a CA 19-9 level of 256.4 U/mL was used as a cutoff point, the specificity and sensitivity was 92.3% and 82.4% respectively. CONCLUSION: Preoperative CA 19-9 levels may be a useful marker for determining preoperatively which patients have unresectable disease despite the demonstration on CT of resectable disease.

Increased expression of cyclooxygenase-2 (COX-2) in radiation-induced small bowel injury in rats.

BACKGROUND: Radiation therapy is a widely used adjuvant therapy for various abdominal and pelvic cancers. On the other hand, it is not a benign treatment modality, as most radiation patients suffer from some kind of radiation enteritis. Currently available treatments are only palliative and no ideal compound has as yet been discovered. The aim of this study was to evaluate cyclooxygenase-2 (COX-2) expression, and to investigate the possible protective effect of the selective COX-2 inhibitor, Rofecoxib, in acute and late stages of radiation-induced intestinal injury in rats. MATERIALS AND METHODS: Forty-eight male Sprague-Dawley rats were randomly divided into eight groups. After abdominal irradiation of all of the animals except the six in the control group, the expression of the enzyme cyclooxygenase-2 (COX-2) was evaluated in different cell types present in the intestinal wall 2 h post exposure (study day 0) and again on study days 4, 14, and 60. The effects of Rofecoxib on histological damage, intestinal myeloperoxidase (MPO) activity, and malondialdehyde (MDA) levels were also measured. RESULTS: Expression of COX-2 in vascular endothelial cells was found to be significantly increased on post exposure days 4 and 14 (2.4 and 2.9 stained vessels/high power field [hpf] respectively compared to 1.3 vessels/hpf for controls) (P = 0.002). Expression of COX-2 in fibroblasts increased immediately after irradiation (29 cells/hpf 2 h after irradiation compared to 12 cells/hpf for non-irradiated control animals) and remained high during the entire study period (P < 0.001), whereas there was a peak COX-2 expression (54.9 cells/hpf) on day 14 that was similar to what was observed in endothelial cells. Irradiation of rats significantly increased intestinal epithelial damage, MPO activity, and MDA levels in comparison to the control group in a time-dependent fashion. Treatment with rofecoxib significantly decreased these elevations except on day 4 of the study. CONCLUSION: The current study suggests that the COX-2 pathway is involved in radiation induced intestinal injury and that targeting COX-2 may be useful in limiting radiation enteritis.