NCIthesaurus vulvar benign neoplasm vulvar granular cell tumor NCI:C40328 UMLS_CUI:C1520083 DOID:5043 A vulvar benign neoplasm of neural origin that is characterized by round to polyhedral cells with indistinct margins and granular cytoplasm due to the accumulation of lysosomes. They occur in ribbons or clumps separated by hyalinised stroma and collaged fibers with uniform, small and dark staining nuclei. disease_ontology