Eccrine Poroma: A Case Report.

Eccrine poroma is a benign adnexal neoplasm often mistaken for pyogenic granuloma, skin tag, squamous cell carcinoma, and other soft-tissue tumors. We describe a 69-year-old woman with a soft-tissue mass on the lateral aspect of her right hallux that was initially clinically diagnosed as a pyogenic granuloma. Histologic examination proved that this mass was instead an eccrine poroma, the rare benign sweat gland tumor. This case exemplifies the importance of a broad differential diagnosis, especially regarding soft-tissue masses of the lower extremity.

Utility of immunohistochemical markers in differentiating benign from malignant follicular-derived thyroid nodules.

BACKGROUND: Thyroid nodules are common among adults though only a small percentage is malignant, which can histologically mimic benign nodules. Accurate diagnosis of these thyroid nodules is critical for the proper clinical management. METHODS: We investigated immunoexpression in 98 surgically removed benign thyroid nodules including 52 hyperplastic nodules (HN) and 46 follicular/Hurthle cell adenomas (FA), and 54 malignant tumors including 22 follicular carcinoma (FC), 20 classic papillary carcinoma (PTC), and 12 follicular variant papillary carcinoma (FVPC). RESULTS: The staining results showed that malignant tumors express galectin-3, HBME-1, CK19 and Ret oncoprotein significantly more than benign nodules. The sensitivity of these markers for the distinction between benign and malignant lesions ranged from 83.3% to 87%. The sensitivity of two-marker panels was not significantly different. Immunoexpression was usually diffuse and strong in malignant tumors, and focal and weak in the benign lesions. CONCLUSION: Our findings indicate that these immunomarkers are significantly more expressed in malignant tumors compared to benign lesions and may be of additional diagnostic value when combined with routine histology.

Pulmonary carcinosarcoma initially presenting as invasive aspergillosis: a case report of previously unreported combination.

Carcinosarcoma of the lung is a malignant tumor composed of a mixture of carcinoma and sarcoma elements. The carcinomatous component is most commonly squamous followed by adenocarcinoma. The sarcomatous component commonly comprises the bulk of the tumor and shows poorly differentiated spindle cell features. Foci of differentiated sarcomatous elements such as chondrosarcoma and osteosarcoma may be seen. Aspergillus pneumonia is the most common form of invasive aspergillosis and occurs mainly in patients with malignancy, immunocompromising or debilitating diseases. Patients with Aspergillus pneumonia present with fever, cough, chest pain and occasionally hemoptysis. Tissue examination is the most reliable method for diagnosis, and mortality rate is high.We describe a case of primary carcinosarcoma of the lung concurrently occurring with invasive pulmonary aspergillosis in a 66-year old patient.

Differential expression of galectin-3, CK19, HBME1, and Ret oncoprotein in the diagnosis of thyroid neoplasms by fine needle aspiration biopsy.

BACKGROUND: Fine needle aspiration biopsy (FNAB) is a common and excellent procedure for the evaluation of thyroid lesions that require surgical resection. At times, the FNAB diagnosis can be difficult, particularly of follicular-patterned lesions. Previous studies have shown that some immunohistochemical (IHC) markers may be helpful in establishing more accurate diagnosis. In this study, our goal was to evaluate four of the recently investigated markers in differentiating benign from malignant thyroid nodules on FNABs. MATERIALS AND METHODS: We performed IHC staining of galectin-3, Ret oncoprotein (Ret), HBME-1, and cytokeratin 19 (CK19), on cell block sections of thyroid FNAB cases that had corresponding surgical resections. They included 44 benign lesions (37 hyperplastic or cellular nodules, HN; and 7 follicular adenomas, FA) and 27 malignant tumors (6 follicular carcinoma, FC; 19 classic papillary carcinoma, PTC; and 2 follicular variant of papillary carcinoma, FVPC). The stains were done according to the standard avidin-biotin-peroxidase method. RESULTS: Statistical analysis showed that immunoexpression was significantly higher in the malignant group for all four markers. The sensitivity for positive expression for all benign lesions versus malignant tumors was as follows: 10/44 (22.7%) versus 25/27 (92.6%) for galectin-3; 14/44 (31.8%) versus 23/27 (85%) for Ret; 12/44 (27.3%) versus 24/27 (88.8%) for HBME-1; and 13/44 (29.5%) versus 23/27 (85%) for CK19. The sensitivity and specificity was highest for galectin-3 (92.6% and 77.3%, respectively) followed by HMBE-1 (88.9% and 72.7%, respectively). When combining the markers' expressions, the panel of galectin-3 + HBME-1 showed the highest sensitivity and specificity (90.7% and 75%, respectively), but this was, however, lower than galectin-3 alone (92.3% and 77.3%, respectively). CONCLUSION: We conclude that galectin-3 is the best single marker in differentiating benign from malignant thyroid lesions with the highest sensitivity and specificity. The galectin-3 + HBME-1 was the best combination for distinguishing benign from malignant lesions. Because they were the best two independent and combined markers, we recommend the use of the galectin-3 + HBME-1 panel to enhance the diagnostic accuracy of follicular-patterned thyroid lesions on FNABs.

Aspiration biopsy cytology of ectopic thyroid tissue in the lateral chest wall: a case report.

BACKGROUND: Ectopic thyroid tissue is a rare abnormality that mainly occurs in the midline of the neck but also in other unusual locations. Because fine needle aspiration biopsy (FNAB) is a widely used procedure for evaluating head and neck and other palpable masses, sampling of these lesions may be encountered. CASE: A 66-year-old woman presented with left lateral chest wall mass during follow-up for chronic obstructive pulmonary disease, hypertension and diabetes mellitus. Initial evaluation by FNAB suggested ectopic thyroid tissue, which was confirmed later by tissue biopsy and immunostains. This is the first reported case of ectopic thyroid tissue in the lateral chest wall area. CONCLUSION: Awareness of this abnormality and the possibility of ectopic thyroid tissue in erratic locations will help cytopathologists make the correct interpretation on FNAB sampling.

Aspiration biopsy cytology of tumoral calcinosis: a case report.

BACKGROUND: Tumoral calcinosis (TC) is a rare inherited disorder leading to the formation of periarticular calcified masses. Aspiration cytology of this condition has been rarely reported. We describe the aspiration cytology findings of a recent case of TC and discuss possible differential diagnoses. CASE: This is a case of a 35-year-old African-American man who presented with a right posterior chest/shoulder mass. The patient had a history of resection of right shoulder (1996) and left neck (2007) masses histologically diagnosed as TC. He recently also had a right-side neck mass that, surprisingly, was found to be extraabdominal desmoid fibromatosis on histologic examination. CONCLUSION: Inherited idiopathic TC is a rare disease commonly presenting as a periarticular mass, which may be subjected to aspiration biopsy. Awareness of this distinct entity and the aspiration cytologic features helps avoid incorrect interpretation.

Chondroblastic osteosarcoma of the cuboid: a literature review and report of a rare case.

UNLABELLED: Chondroblastic osteosarcoma accounts for about 25% of all cases of osteosarcoma, which is the most common primary malignancy of the skeleton. Currently, only a few cases of chondroblastic osteosarcoma have been reported to involve the bones of the foot. In this report, we describe the previously unreported occurrence of chondroblastic osteosarcoma involving the left tarsal cuboid in a 15-year-old male. Histologically, the tumor showed an unusually extensive osteoclastic giant cell reaction that initially led to an erroneous diagnosis of giant cell tumor of bone. Because treatment and prognosis are very different for chondroblastic osteosarcoma as compared to giant cell tumor of bone, it is important to make the distinction between these 2 different bone tumors. In this report, we wish to draw attention to occurrence of chondroblastic osteosarcoma in the small bones of the foot, and to the possibility of an extensive giant cell reaction making accurate diagnosis difficult. We also provide a comprehensive review of the literature related to chondroblastic osteosarcoma. LEVEL OF CLINICAL EVIDENCE: 4.

Differentiating reactive mesothelial cells from metastatic adenocarcinoma in serous effusions: the utility of immunocytochemical panel in the differential diagnosis.

Differentiating reactive mesothelial cells (RMs) from metastatic adenocarcinoma cells (MAC) in serous fluids based on cytomorphologic features alone can be very challenging. Various immunocytochemical (ICC) markers have been used to maximize the diagnostic accuracy, however, cytopathologists still encounter difficulties in effusion cytologic diagnosis. The aim of this study was to evaluate previous and recent ICC stains to identify the most sensitive and specific markers and the best panel for differentiating RM from MAC. Cell block sections from 41 MAC and 43 RM effusions cases were subjected to ICC staining for MOC-31, BerEp4, carcinoembryonic antigen (CEA), calretinin, HBME-1, CK5/6, and D2-40. For the MAC cases, the sensitivity of BerEp4, MOC-31, and CEA was 82.9, 92.6, and 17%, respectively, and the specificity was 95.3, 93, and 100%, respectively. For the RM cases, the sensitivity of calretinin, CK5/6, D2-40, and HBME-1 was 95.3, 27.9, 58.1, and 93%, respectively, and the specificity was 70.7, 73.1, 75.6, and 82.9%, respectively. The results show that BerEp4 and MOC-31 are highly sensitive and specific for detecting MAC, whereas calretinin and HBME1 are highly sensitive but only modestly specific for detecting RM cases (P < 0.05). Forced entry logistic regression revealed that using MOC-31, BerEp4, HBME-1, and calretinin, is an excellent panel for making correct diagnosis with 97.6% sensitivity in detecting MAC and 90.7% specificity in detecting RM. We conclude that adding a panel of MOC-31, BerEp4, calretinin, and HBME-1 immunostains to routine cytomorphologic features can greatly enhance the diagnostic accuracy of serous effusions.

Discriminating hepatocellular carcinoma from metastatic carcinoma on fine-needle aspiration biopsy of the liver: the utility of immunocytochemical panel.

The cytomorphologic features of hepatocellular carcinoma (HCC) in fine-needle aspiration (FNA) biopsy are well described. However, correctly diagnosing HCC on cytologic features alone and differentiating it from metastatic adenocarcinoma (MAC) remains a challenge. Studies have recommended the use of various immunocytochemical (ICC) stains to aid in the diagnosis and distinction of these tumors with variable success rates. In this study, we evaluated a panel of seven ICC stains, HepPar1, glypican-3, polyclonal and monoclonal carcinoembryonic antigen (pCEA, mCEA), MOC-31, CK7, and CK20, in 42 FNA cases of HCC and 48 FNA cases of MAC. The aim was to identify the most sensitive and specific markers and the best panel for accurate diagnosis. Overall, 38 of 42 HCC and 44/48 MAC tumors were correctly identified by a panel of four markers, CK7, MOC-31, HepPar1, and glypica-3, with accuracy rate of 90.5 and 91.7%, respectively. In the HCC group, glypican-3 was most sensitive and detected in 34/42 (81%), whereas HepPar1 and pCEA were less sensitive and detected in 30/42 (71.4%) and 21/42 (50%), respectively. In the MAC group, MOC-31 was most sensitive and detected in 38/48 (79.2%), followed by CK7 in 20/48 (41.7%). Stepwise logistic regression analysis showed that a panel of glypican-3, HepPar1, MOC-31, and CK7 is most helpful in diagnosing and accurately differentiating HCC from MAC on FNA biopsies of the liver. We conclude that a panel of HepPar1, glypican-3, MOC-31, and CK7 accurately and statistically significantly differentiates these two malignancies (P < 0.05).

Fine needle aspiration biopsy of intraoral and oropharyngeal mass lesions.

BACKGROUND: Fine needle aspiration (FNA) biopsy has been rarely used in oral and oropharyngeal lesions. The goal of this study was to assess the value and accuracy of FNA biopsy in the diagnosis of oral and oropharyngeal lesions particularly in regards to discriminating benign from malignant tumors. METHODS: Sixteen cases of FNA biopsies obtained of various intraoral and oropharyngeal masses or lesions performed at our institution during the eight-year period from 1998 to 2006 were retrospectively reviewed. The aspiration cytologic diagnoses were correlated with the histologic examination of the corresponding resected lesions. RESULTS: Sixteen cases of intraoral lesions evaluated by FNA biopsies during the period of 1998-2006 were reviewed. The sites of involvement were: lip 1, maxillary sinus 3, pharynx/oropharynx 5, floor of mouth 4, buccal mucosa 2 and peritonsillar area 1. Patients' age ranged from 30 to 87 with an average of 54 years. Male to female ratio was 1:3. Cytologically, 7 cases were diagnosed as suspicious/malignant, and 9 cases as benign (including 6 benign neoplasm, 1 atypical, and 2 reactive or "descriptive"). Fifteen cases had corresponding surgical resection for histologic examination, of these, 9 cases were interpreted as malignant, and 6 as benign. There were no false positive diagnoses of malignancy on FNA. Two cases were interpreted as benign or atypical cytologically, but were found to be malignant on histologic examination. CONCLUSION: FNA biopsy of intraoral and oropharyngeal masses is a valuable procedure for the initial evaluation of various lesions. It provides helpful information about these lesions and avoids hasty or unnecessary surgical biopsy. It is a rapid and relatively noninvasive procedure. Furthermore, aspiration biopsy is an important tool in the diagnosis and management of these lesions, both neoplastic and non-neoplastic, and can be sometimes complemented by ancillary studies for more accurate interpretation. However, its sensitivity in the diagnosis of malignancy is lower than that of histologic samples. This is probably due to the superficial nature and small size of these lesions, the limited space for maneuvering the needle and difficulty in immobilizing the lesion to obtain adequate samples, rather than to interpretation or inherent limitations of the technique itself.

Comparison of Thin-Prep and cell block preparation for the evaluation of Thyroid epithelial lesions on fine needle aspiration biopsy.

BACKGROUND: The objective of this study was to compare the utility of Thin-Prep (TP) cytologic preparation with that of Cell Block (CB) preparation in the diagnosis of thyroid lesions, mainly follicular epithelial lesions, by fine needle aspiration biopsy (FNAB). Feasibility of using the TP slides for immunocytochemical stains is also discussed. METHODS: A total of 126 consecutive cases of thyroid FNAB with TP slides and 128 consecutive cases of thyroid FNAB with CB slides were reviewed blindly by two cytopathologists. The presence of colloid, follicular cells, macrophages and lymphocytes/plasma cells were recorded and scored 0-4 on each case based on TP or CB slide review. The cytologic diagnoses were grouped as follows: cyst, colloid nodule, colloid nodule with cystic change, chronic thyroiditis, atypical/neoplastic and non-diagnostic. RESULTS: The TP slides had higher diagnostic rate than CB slides. The diagnostic yield was 68% of the TP slides whereas only 24% of the CB slides were diagnostic. Also, only 4 atypical/neoplastic lesions were diagnosed on the TP slides and the corresponding direct smears, while 5 cases of atypical/neoplastic lesions were diagnosed on the smears but could not be diagnosed on the corresponding CB slides. Additionally, the TP slides revealed cytologic features that were not observed on the direct traditional smears of the same case. CONCLUSION: In thyroid FNAB cases, TP slide preparation is superior to CB slide preparation and is more likely to have greater cellularity for diagnosis and detect atypical/neoplastic thyroid lesions, particularly those of follicular cell origin. Furthermore, TP slides appear to detect helpful diagnostic cytologic features and should be considered complementary to, rather than replacing, direct smears.

Conjunctival changes in children with Kawasaki disease: cytopathologic characterization.

OBJECTIVE: To examine the cytopathological changes in the conjunctiva of patients with active Kawasaki disease. STUDY DESIGN: Case-control prospective study. Bilateral conjunctival swabs were obtained from 3 groups of children: patients with acute KD (11), age-matched controls (7), and patients with inactive KD (9). The ThinPrep prepared and Papanicolaou stained smears were examined blindly by 2 cytopathologists. The cell count differential of cells was performed and recorded quantitatively and comparisons between the 3 patient groups were made. RESULTS: Only neutrophil counts showed a significant difference among the 3 groups. The average scores for the acute KD, control group, and patients with inactive KD were 3.5, 1.6 and 1.3, respectively. Using the Pearson chi2 test, the difference between the acute KD and the inactive group was statistically significant for both eyes (right p = 0.049, left p = 0.004). Samples from acute KD patients were more cellular. Neutrophils surrounding conjunctival epithelial cells, or "neutrophilic rosetting", were seen in 4 (36%) cases of the active disease group but not in the other groups. CONCLUSION: "Neutrophilic conjunctivitis" is characteristic in patients of acute KD that may be of value in the initial evaluation and subsequent follow-up of KD patients.

Duodenal MALT lymphoma presenting with obstructive jaundice: report of a case and review of the literature.

BACKGROUND: Mucosa-associated lymphoid tissue (MALT) lymphoma is a rare type of non-Hodgkin's lymphoma. The most common site for MALT lymphoma is the stomach. CASE REPORT: We are reporting a case of a 57-year-old man who presented with obstructive jaundice and was found to have duodenal MALT lymphoma. Unlike gastric MALT lymphoma which is responsive to Helicobacter pylori eradication therapy, duodenal MALT lymphoma does not have a definitive treatment. DISCUSSION: To our knowledge, this is the first report of a duodenal MALT lymphoma presenting clinically as obstructive jaundice. We describe this case to alert physicians to consider this disease in the differential diagnosis of obstructive jaundice.