title: Malignant retroperitoneal paraganglioma: unusual light and electron microscopic findings.
mesh_terms: D000368:Aged; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D006801:Humans; D002479:Inclusion Bodies / Q000648:ultrastructure; D008297:Male; D008854:Microscopy, Electron; D010235:Paraganglioma / Q000648:ultrastructure*; D012186:Retroperitoneal Neoplasms / Q000648:ultrastructure*