title: Pheochromocytoma with posthemorrhagic cystic degeneration: magnetic resonance imaging findings.
abstract: We describe in vivo and in vitro magnetic resonance imaging (MRI) findings of a pheochromocytoma with posthemorrhagic cystic degeneration in a 74-year-old man. The in vivo MR images showed the mass as an area of homogeneous moderate hyperintensity with a central area of intense hyperintensity outlined by a thin hypointense rim on a T2-weighted image. The in vitro MR images showed a hyperintense rim around the central cystic area consistent with hemorrhage on T1-weighted gradient-echo images with short echo times (1.6 and 4.2 msec) and more distinctly revealed the blurring effect due to susceptibility of hemosiderin on those with long echo times (6 and 8 msec). Hemosiderin deposition caused by intraparenchymal hemorrhage in the pheochromocytoma can be appreciated on spoiled gradient-echo images with different echo times, which is ordinarily included in the MRI protocol as phase-shift imaging.
authors.affiliation: Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Goshima
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kanematsu
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kondo
authors.forename: Ryujiro
authors.initials: R
authors.lastname: Yokoyama
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Hoshi
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Moriyama
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000150:complications / Q000473:pathology* / Q000601:surgery; D000368:Aged; D003560:Cysts / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D006470:Hemorrhage / Q000209:etiology / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010673:Pheochromocytoma / Q000150:complications / Q000473:pathology* / Q000601:surgery