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Introduction: Mediastinum is the central portion of the thoracic cavity, compartmentalization of which into anterior, middle, and posterior compartments is useful in understanding the vast diversity of pathological lesions in this space. Cysts, inflammatory lesions, various primary, and metastatic tumors are found in this region, which tend to have a predilection for specific area of mediastinum depending on histopathological type. Objective: The objective was to study the clinicoradiological features and histopathological findings in patients presenting with mediastinal masses in a tertiary care hospital over a period of 10 years. Materials and Methods: This is a retrospective cross-sectional study of cases presenting as mediastinal lesions. Detailed clinical history and radiological findings were noted wherever available. Histopathology and immunohistochemical slides were reviewed. The data were analyzed using mean and percentage. Results: Twenty-four cases of mediastinal lesions were found in this study. It included 4 nonneoplastic lesions, 12 benign, and 8 malignant neoplastic cases. The age ranged from 3 months to 79 years. About 18 cases (64%) were located in the anterior mediastinum, and thymoma (8/18) was the most common lesion. One case each of pericardial cyst, bronchial cyst, and Hodgkin's lymphoma were seen in the middle mediastinum. Three cases of schwannoma and one case of neuroendocrine carcinoma were seen in the posterior mediastinum. Pan-cytokeratin, lymphoma panel, neuroendocrine markers, and placental alkaline phosphatase were done in neoplastic lesions to confirm the diagnosis. Conclusion: This study reflects the varied mediastinal lesions and importance of triad of clinical, radiological, and meticulous immunohistopathological examination for arriving at an appropriate diagnosis. [ABSTRACT FROM AUTHOR]

Introduction: Breast Cancer (BC) is the second most common cancer among women in India and accounts for 7% of global burden of BC and one-fifth of all Cancers (CA) among women in India. Aim: This study was conducted for studying the expression of MUC1, MUC2 and MUC5AC in breast carcinoma. Materials and Methods: Fifty cases of primary breast carcinoma diagnosed between years 2013 to 2015 were included in the study. Manual tissue array technique was applied for cases subjected to Immunohistochemistry (IHC). An analysis of the expression of IHC markers (MUC1, MUC2, MUC5AC, ER, PR and HER2/neu) was attempted. Results were subjected to statistical analysis. They were considered to be significant when the p-value was less than 0.05. Results: The positivity for MUC1, MUC2 and MUC5AC in BC was 58%, 8% and 6% and for ER, PR and HER2 was 48%, 36% and 64% respectively. There was a significant correlation between MUC1 expression and ER and PR positivity. There was a significant correlation between MUC2 expression and ER positivity. No significant association was observed between MUC2 and PR expression, MUC5AC expression and ER and PR positivity. There was statistically significant correlation between negative MUC2 and MUC5AC expression and histopathological grade. It was noted that MUC2 and MUC5AC negative tumours were associated with higher tumour stage though not statistically significant. It was noted that MUC5AC negative tumours showed higher frequency of lymphovascular invasion though not statistically significant. Conclusion: Our experience with the present study highlights the role of mucins in the development and progression of BC. [ABSTRACT FROM AUTHOR]

Introduction: Granulomatous Mastitis (GM) is a rare, benign, inflammatory disease of the breast. It is a well known mimicker of malignancy, clinically and radiologically. Patients are often subjected to number of tests for the right diagnosis. Non-specific Granulomatous Mastitis (NGM) and Tubercular Mastitis (TBM) are chief among the various causes of GM. They are important to be diagnosed early as their treatment varies significantly. Fine Needle Aspiration Cytology (FNAC) is simple, patient friendly and primary investigation modality in cases of lump in breast., Aim: To find out the utility of FNAC in differentiating NGM and TBM., Materials and Methods: All cases of granulomatous mastitis diagnosed on cytology over eight years were retrospectively retrieved. The clinical and radiological history was obtained from the patient file. The slides were stained with haematoxylin and eosin stain as well as Leishman stains. Special stains like Periodic Acid Schiff (PAS) and Ziehl Neelsen (ZN) stain were used for fungus and Mycobacterium tuberculosis respectively. Histopathological correlation of the available cases was done. Clinical presentation and cytological morphology of individual cases was studied in detail., Results: Twenty one cases of GM obtained, of which 16 were NGM and five were TBM. Both diseases were common among young reproductive women who presented with unilateral breast lump of varying duration. Almost 25% of NGM and 60% of TBM has clinical suspicion of malignancy. About 30% had radiological suspicion of malignancy. Nearly 62.5% of NGM patients had painful swelling and none of tubercular mastitis patients had pain. About 31% of NGM patients underwent prior abscess drainage and 40% of TBM patients gave history of tuberculosis. Almost 6.25% of NGM and 60% of TBM had axillary lymphadenopathy. Cytologically epithelioid cells were identified in 100% of patients whereas, granulomas were seen in 62.5% and 80% of NGM and TBM smears respectively. Langhans giant cells were frequent among TBM and foreign body giant cell among NGM. Caseous necrosis was seen in 60% of TBM and absent in NGM smears., Conclusion: Though, NGM and TBM is said to have overlapping features, our study highlights few clinical and cytological differences which aid in differentiating the two entities at primary level. FNAC along with special stain must be advocated as the primary tool of diagnosis in cases of GM.