title: Pheochromocytoma.
abstract: The cytoplasmic granules in an adrenal pheochromocytoma were predominantly ovoid with loose-fitting limiting membranes and eccentrically positioned dense cores. The occurrence of similar granules in a recurrent tumor involving the organ of Zuckerkandl in a second patient suggests that the latter tumor should be designated an extraadrenal pheochromocytoma.
authors.affiliation: Department of Pathology, University of Texas, M. D. Anderson Cancer Center, Houston 77030.
authors.forename: R R
authors.initials: RR
authors.lastname: Gómez
authors.forename: B M
authors.initials: BM
authors.lastname: Osborne
authors.forename: N G
authors.initials: NG
authors.lastname: Ordoñez
authors.forename: B
authors.initials: B
authors.lastname: Mackay
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D005260:Female; D006801:Humans; D008854:Microscopy, Electron; D008875:Middle Aged; D010673:Pheochromocytoma / Q000473:pathology* / Q000648:ultrastructure