title: Solitary subcutaneous sarcoidosis with massive chronic prepatellar bursal involvement.
abstract: A 56-year-old man presented with a painless prepatellar mass of the left knee. MR images demonstrated a large, well-defined mass with heterogeneous intermediate signal intensity on T1- and proton density-weighted images. Mild, heterogeneous enhancement was noted after the intravenous administration of gadolinium. Diagnostic imaging included atypical soft-tissue infection, fibrogranulomatous reaction, gouty tophus, rheumatoid nodule and xanthoma or possibly malignancy. The histopathological examination revealed sarcoidosis involving the prepatellar bursa.
authors.affiliation: Department of Diagnostic and Therapeutic Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, 270 Rama VI Road, Rachathewi, Bangkok, Thailand, 10400. thumanoon.rua@outlook.com.
authors.forename: Thumanoon
authors.initials: T
authors.lastname: Ruangchaijatuporn
authors.affiliation: Radiology Service, VA San Diego Healthcare System, San Diego, CA, 92161, USA.|Department of Radiology, University of California, San Diego Medical Center, San Diego, CA, 92103, USA.
authors.forename: Eric Y
authors.initials: EY
authors.lastname: Chang
authors.affiliation: Radiology Service, VA San Diego Healthcare System, San Diego, CA, 92161, USA.|Department of Radiology, University of California, San Diego Medical Center, San Diego, CA, 92103, USA.
authors.forename: Christine B
authors.initials: CB
authors.lastname: Chung
mesh_terms: D002061:Bursa, Synovial / Q000000981:diagnostic imaging* / Q000473:pathology; D003240:Connective Tissue Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D007717:Knee / Q000000981:diagnostic imaging* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012507:Sarcoidosis / Q000000981:diagnostic imaging*
keywords: Knee; Prepatellar bursitis; Sarcoidosis