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BACKGROUND Localized tenosynovial giant cell tumor of tendon sheath (TGCT-L) is a benign, slowly growing lesion with a peak incidence in the third to fifth decade of life. It is thought to arise from the synovium of tendon sheaths, frequently affecting interphalangeal joints of the hands, feet, ankles and knees. Although the histopathologic appearances are well established, only a few reports describe the cytomorphology of this lesion. CASE A 37-year-old female presented with a slowly growing, nontender mass located near the left ankle joint. The cytologic features of localized tenosynovial giant cell tumor of tendon sheath (TGCT-L) include abundant mononuclear histiocytic cells occurring singly and in three-dimensional tissue fragments, hemosiderin within histiocytes and a few multinucleated giant cells. Subsequently, the histopathologic examination of the surgical specimen was proven to be TGCT-L. CONCLUSION Fine needle aspiration cytology can be used as a diagnostic tool for early and accurate detection of TGCT-L since the cytologic features combined with clinical details are sufficiently distinctive.

BACKGROUND Malakoplakia is an uncommon but distinctive granulomatous disease, characterized by an accumulation of histiocytes or Von Hansemann cells containing intracytoplasmic, laminated Michaelis-Gutmann bodies. CASE A 3-year-old male presented with a tender swelling in the left gluteal region that had been present for one month. Smears made from a fine needle aspirate showed large histiocytic cells containing intracytoplasmic, basophilic, laminated, targetoid Michaelis-Gutmann bodies resembling Von Hansemann cells in malakoplakia. Histopathology confirmed the diagnosis of malakoplakia of bone. CONCLUSION This case, histologically proven to be malakoplakia, demonstrated regression of the lesion following therapy. The characteristic cytologic features and presence of Von Hansemann cells may in themselves be diagnostic and obviate the need for biopsy.

Malignant mesenchymal tumors constitute1% of all malignant neoplasms of the breast. These include pure primary sarcoma of the breast, metastatic sarcoma and sarcomatous patterns in metaplastic carcinomas. On fine needle aspiration cytology (FNAC), the cellular features can suggest the diagnosis of sarcoma of the breast, although the potential exists for confusion with very poorly differentiated carcinoma.A case of recurrent primary malignant fibrous histiocytoma (MFH) occurred in the breast in a 32-year-old woman. The patient presented with a fungating mass in the right breast. FNAC was suggestive of malignant mesenchymal tumor, most probably MFH. The diagnosis was confirmed on biopsy.Malignant fibrous histiocytoma of the breast is a rare entity, and a complete clinicopathologic correlation with immunohistochemical profile is essential to arrive at a correct diagnosis and guide appropriate management of the patient.