LEIOMYOSARCOMA OF THE KIDNEY - REPORT OF A CASE DIAGNOSED BY FINE-NEEDLE ASPIRATION CYTOLOGY AND ELECTRON-MICROSCOPY

A 41-year-old man presented with a large abdominal tumor that yielded, in the fine needle aspiration biopsy, dyshesive, pleomorphic malignan t cells. Electron microscopy of the aspirated material revealed nonepi thelial cells showing intracytoplasmic bundles of microfilaments with vague focal densities and micropinocytotic vesicles along the cell mem brane, suggesting a malignant leiomyosarcoma, which was confirmed by m icroscopic examination of the resected right kidney. The patient died four months after surgery from widespread metastases.