title: Encapsulated fat necrosis mimicking subcutaneous liposarcoma: radiologic findings on MR, PET-CT, and US imaging.
abstract: We present a case of a subcutaneous encapsulated fat necrosis of the upper extremity that mimicked subcutaneous liposarcoma because of heterogeneous signal intensity, its relatively large size, and pronounced enhancement on magnetic resonance imaging (MRI). For this case, we present the radiologic findings including MRI, positron emission tomography-computed tomography (PET-CT), ultrasonography, and radiography. We emphasize the imaging features of this lesion, which has a fibrous capsule and briefly discuss its nomenclature and pathophysiology.
authors.affiliation: Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul 138-736, Korea.
authors.forename: Seun Ah
authors.initials: SA
authors.lastname: Lee
authors.forename: Hye Won
authors.initials: HW
authors.lastname: Chung
authors.forename: Kyung Ja
authors.initials: KJ
authors.lastname: Cho
authors.forename: Chang Keun
authors.initials: CK
authors.lastname: Sung
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Lee
authors.forename: Min Hee
authors.initials: MH
authors.lastname: Lee
authors.forename: Myung Jin
authors.initials: MJ
authors.lastname: Shin
mesh_terms: D003937:Diagnosis, Differential; D003952:Diagnostic Imaging / Q000379:methods*; D005218:Fat Necrosis / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008080:Liposarcoma / Q000175:diagnosis*; D008875:Middle Aged; D012878:Skin Neoplasms / Q000175:diagnosis*