title: Ancient neurilemmoma: a pitfall in the cytologic diagnosis of soft-tissue tumors.
abstract: A case of ancient neurilemmoma (Schwannoma) is presented that, owing to a severe cell pleomorphism, was falsely interpreted as a malignant spindle-cell sarcoma by fine-needle aspiration cytology. Cytological features of the tumor are given together with its histopathology and electron microscopy findings. The usefulness of electron microscopy on material obtained by fine-needle aspiration biopsies in the diagnosis of soft-tissue tumors is discussed.
mesh_terms: D000328:Adult; D001707:Biopsy, Needle; D003581:Cytodiagnosis; D005189:False Positive Reactions; D006651:Histocytochemistry; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D009442:Neurilemmoma / Q000175:diagnosis* / Q000473:pathology / Q000648:ultrastructure; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000648:ultrastructure