CYTOPATHOLOGY AND ULTRASTRUCTURE OF PRIMARY RHABDOID TUMOR OF LUNG

This case report presents the light microscopy, immunochemistry, and u ltrastructure of the first unequivocal extrarenal rhabdoid tumor occur ring in lung. Smears and cell blocks prepared from a fine-needle aspir ation biopsy show the cytopathological features of this unusual neopla sm, in this case presenting in a 74-year-old male. Electron microscopy of the surgically resected circumscribed pulmonary mass assisted in e stablishing the diagnosis by demonstrating the considerable accumulati on of cytoplasmic intermediate filaments that characterize cells in ex trarenal rhabdoid tumor and account for the hyaline ''inclusion'' in t his particular lesion.