Expression of CD68+ Tumor associated macrophages in relation to ß-catenin in carcinoma stomach.

Background: With no unified system for tumor associated macrophages (TAMs) density assessment, limited information is available on their relationship with ß-catenin expression. Aim: To evaluate the density of CD68+ TAMs in gastric adenocarcinoma samples by immunohistochemistry and correlate it with grade, stage, invasion, and beta-catenin. Designs and Settings: Formalin fixed paraffin embedded (FFPE) blocks from gastrectomy specimens of proven gastric adenocarcinoma were prospectively and retrospectively were studied over a period of two years. Materials and Methods: Immunohistochemistry with CD68 and ß-catenin was performed. TAM density was qualitatively compared in "tumor" versus "stroma" and "tumor" versus "non-tumor" regions. Quantitative CD68+ TAM density was assessed using different methods and compared. Cases were classified as high and low TAM based on the median value and correlated with histologic type, location, grade, stage and ß-catenin expression pattern. Statistical Analysis: Spearman's rank correlation test was used to compare the different methods of TAM density evaluation. The categorical variables were studied using Pearson's Chi-square or Fisher's exact test. CD68+ TAM density and ß-catenin expression were correlated by analysis of variance. A P value ≤ 0.05 was taken as statistically significant. Results: The CD68+ TAMs in the "tumor" versus "non-tumor" area (p = 0.34) and "tumor" versus "stroma distribution" (p = 0.81) did not show any statistical significance. All methods of TAM density were found to be comparable. High TAM group is significantly associated with lymphovascular invasion, tumor depth, lymph node metastasis, and abnormal ß-catenin expression. Conclusion: TAMs density plays an important role in the tumor stage. Macrophages may possibly induce gastric cancer invasiveness by activating ß-catenin pathway.

Non-Hodgkin Lymphoma of Cauda Equina: A Diagnostic Conundrum: Case Report.

Primary central nervous system lymphoma (PCNSL) is uncommon with scarce cases having involvement of the spinal cord. Cauda equina is unique in its location and shows very rare involvement by diseases pathologies. When the same occur, they pose a lot of diagnostic difficulties as the location is difficult to access with overlapping radiologic abnormalities. It is an unusual location for lymphomas to occur with only few cases reported in literature. The cauda equina lymphomas may mimic other entities which occur at that site. Histopathology is the gold standard for the same. Here, we report an unusual case of cauda equina lymphoma mimicking a myxopapillary ependymoma in a 50-year-old male.

Pancreatic collision tumor of ductal adenocarcinoma and neuroendocrine tumor-A rare case report.

A collision tumor is composed of two adjacent histological distinct neoplasms without the histological admixture of cell types in the same organ or tissue. It is rare in pancreas. Herein we report an unusual case of a mixed malignant neuroendocrine tumor (NET) and ductal adenocarcinoma of pancreas in a 24 year old male who presented with history abdomen pain. A clinicoradiological diagnosis of chronic calcific pancreatitis with carcinoma body of pancreas was made. Distal pancreaticosplenectomy specimen showed a grey white, nodular growth measuring 2 x 2 x 1.2 cm on the cut surface of pancreas. Histopathology revealed a composite tumor consisting of ductal and neuroendocrine origin. Immunohistochemistry showed complementary staining for CK7 in adenocarcinoma and chromogranin A in NET areas confirming a collision tumor. Accurate evaluation of the radiologic pointers, histomorphologic evaluation to recognize and quantitate the individual components, appropriate immunohistochemical evaluation and correlation is essential for diagnosis.

Gastric tuberculosis masquerading as advanced malignancy in a young male.

Gastrointestinal tuberculosis usually involves ileum and cecum in three-fourth of cases. Isolated gastric involvement is uncommon in the absence of pulmonary tuberculosis or immunodeficiency in affected individuals. Here, we describe a case of tuberculosis involving stomach and colon in an immunocompetant young patient who presented to us with dyspeptic symptoms, pain abdomen, and melena. Morphologically, the lesion mimicked as advanced malignancy, but laparoscopic biopsy confirmed the diagnosis. The patient responded well to medical treatment. It should be emphasized that tuberculosis can involve any part of gastrointestinal tract including stomach even in immunocompetent individuals, and it should be kept as differential diagnosis of any chronic inflammatory lesion of stomach, especially in endemic countries as medical treatment is usually sufficient to provide a cure.

Angiomyofibroblastoma of the Vulva: A Rare Case Report with Brief Review of Literature.

Angiomyofibroblastoma is an unusual tumor of pelvic and vulval region. It is often diagnosed in the middle-aged women. Although benign owing to its location and morphology, it has a few benign and malignant mimics. Here, we present such a case where a 42-year-old female presented with a vulval mass.

A novel approach to decalcification in histopathology laboratory: An adaptation from the Hammersmith protocol.

AIM: Utility of modified Hammersmith protocol in the deacalcification and/or softening of tissues and samples in a histopathology laboratory were studied. The object of the study was to prepare a novel method for softening/decalcifying tissue for histopathology. MATERIALS AND METHODS: All the hard tissues received in the histopathology section were received in 10% neutral buffered formalin and then placed in freshly prepared combination of 10 mL of concentrated formaldehyde and 5 mL of 10% formic acid in 85 mL distilled water was used for decalcification. The tissue was checked for evidence of adequate decalcification/softening every 6 hours. Those which were decalcified/softened were sent for routine tissue processing and staining, while those which were not, were again placed in formalin. The process was repeated until the tissue was ready for further processing. The routine sections of these slides were reviewed for morphology and stain quality along with special stains and immunohistochemistry performed. The time taken for decalcification, the variables most likely to affect decalcification, the morphology and staining characteristics were documented. Statistical analysis was done to determine the effect of softening/decalcification process on each variable. RESULTS: A total of 201 blocks in 119 specimens from humans including 61 males and 58 females were studied. Time taken was found to have a significant correlation only with the nature of the tissue (bone vs nonbone) and not with any other parameter viz. age, gender, specimen size, type of bone, and nature of pathology. CONCLUSION: This novel and modified method has circumvented the common problems of overdecalcification, preserved morphology, and produced consistent results without interfering with special stains and immunohistochemistry.

"Banana patella", fibrous dysplasia of patella: A rare case report.

INTRODUCTION: Patella is a very uncommon site for primary bone tumours and fibrous dysplasia lesion in patella has never been reported. Fibrous dysplasia is a benign fibrosseous lesion of the bone where the fibrous connective tissue replaces the normal bone. CASE REPORT: We report a case of 23 years female with 7 years history of progressive swelling and anterior knee pain. Radiographs showed enlarged, deformed patella like a shape of banana. The patient underwent patellectomy with extensor mechanism repair and biopsy proved to be fibrous dysplasia. CONCLUSION: Fibrous dysplasia involving patella is very rare and never been reported earlier. Although primary patellar neoplasm are not common but should be kept in mind in chronic anterior knee pain with swelling for early diagnosis and intervention with intralesional therapy otherwise patellectomy has to be done in more advanced, deformed and enlarged lesions.

Clinico-Histomorphological and Immunohistochemical Profile of Anaplastic Pleomorphic Xanthoastrocytoma: Report of Five Cases and Review of Literature.

Background: Pleomorphic xanthoastrocytoma is a rare tumour of children and young adults, particularly for those with features of anaplasia. Materials and Methods : This retrospective study comprises five cases of anaplastic pleomorphic xanthoastrocytomas diagnosed over a period of 4 years in a tertiary care institute. A detailed clinicopathological and immunohistochemical profile of the tumours were noted from the hospital database. Results: Five cases of anaplastic pleomorphic xanthoastrocytomas were evaluated for their clinicoradiological, histomorphological as well as immunohistochemical findings, which included 3 females and 2 males, with age range of 11-40 years and a mean age at presentation of 22 years. Histologically a solid cystic biphasic tumour with moderate to high cellularity, spindled pleomorphic astrocytes, hyperchromatic nuclei showing moderate to marked atypia, intranuclear inclusions, ≥5 mitoses per 10 high power fields, with evidence of necrosis and atypical mitoses was noted. One of the cases showed transformation into glioblastoma with evidence of spinal metastasis on follow-up. The tumours expressed both glial as well as neuronal markers with expression of CD34 with increased Ki 67 ranging between 5-20%. Conclusion: It was concluded that PXA, a low-grade glioneuronal tumour, can show odd site presentation, marked pleomorphism, increased mitosis, atypical mitoses and increased Ki 67 when associated with features of anaplasia. An appropriate panel of immunohistochemical markers in conjunction with a detailed evaluation of histomorphological features and clinicoradiological information are useful for its diagnosis.

Proximal epithelioid sarcomatous dedifferentiation in secondary chondrosarcoma in a known case of multiple osteochondromatosis.

Osteochondroma is the most common benign bone tumor. Approximately 15% of osteochondromas occur as multiple lesions. Multiple osteochondromatosis has a higher risk of developing chondrosarcomas, which are of low grade with good prognosis. About 10% of all chondrosarcomas may undergo dedifferentiated change, which has a poorer prognosis. Dedifferentiated peripheral chondrosarcoma developing within an osteochondroma is extremely rare. Dedifferentiation usually occurs in the form of osteosarcoma, malignant fibrous histiocytoma, fibrosarcoma, or rhabdomyosarcoma. We report a case of proximal epithelioid sarcomatous dedifferentiation in secondary chondrosarcoma in a 39-year-old male with multiple osteochondromatosis in bilateral arm. To the best of our knowledge, epithelioid sarcomatous dedifferentiation has not been described in the literature.

Squamous Cell Carcinoma of Cervix with Isolated Metastasis to Ethmoidal Sinus: A Rare Occurrence.

Squamous Cell Carcinoma (SCC) of the cervix is a highly prevalent malignancy. Its spread and metastasis is mostly loco-regional. The occurrence of distant extra-pelvic metastases is exceedingly rare, particularly with the involvement of paranasal sinus. This case report documents an unusual presentation of a 45-year-old female diagnosed and treated for squamous cell carcinoma of cervix with metastatic deposits in the ethmoidal sinus without deposits in any intervening foci.

Lipoblastoma presenting as a rapidly growing paravertebral mass and masquerading as myxoid liposarcoma on fine needle aspiration cytology.

Lipoblastoma is a peculiar variant of lipoma occurring almost exclusively during infancy and early childhood. It is found most commonly in the upper and lower extremities; less common sites are head and neck, trunk, mediastinum, and retroperitoneum. It has a greater predilection for boys and commonly presents as a slowly growing soft-tissue mass. We present here the case of a five- year old female child with a lipoblastoma presenting as a paravertebral mass in the right lower back which progressed rapidly in the previous six months causing diagnostic difficulty on fine needle aspiration cytology.