title: Intravascular papillary endothelial hyperplasia: magnetic resonance imaging of finger lesions.
abstract: OBJECTIVE
  To describe magnetic resonance imaging (MRI) features of intravascular papillary endothelial hyperplasia (IPEH), to identify findings differentiating IPEH of the finger from that of other locations, and to correlate these with pathology.
  
  
  METHODS
  Nineteen patients with 20 I.E. masses of the finger (n = 13) and other locations (n = 7) were evaluated. All patients underwent MRI, and the results were correlated with pathology.
  
  
  RESULTS
  Seventeen IPEHs, including all IPEHs of the finger, were located in the subcutis, the three other lesions in the muscle layer. On T1WI, all masses were isointense or slightly hyperintense. IPEHs of the finger (n = 13) revealed focal hyperintense nodules (n = 2) or central hypointensity (n = 2) on T1WI, hypointensity with a hyperintense rim (n = 7), hyperintensity with hypointense nodules (n = 5), or isointensity with a hypointense rim (n = 1) on T2WI, and rim enhancement (n = 5), heterogeneous enhancement with nodular nonenhanced areas (n = 6), peripheral nodular enhancement (n = 1), or no enhancement (n = 1) on gadolinium-enhanced T1WI. IPEHs of other locations (n = 7) demonstrated focal hyperintense nodules (n = 5) on T1WI, hyperintensity with hypointense nodules (n = 5) or heterogeneous signal intensity (n = 2) on T2WI, and rim or rim and septal enhancement (n = 6) or peripheral nodular enhancement (n = 1). Microscopically, IPEHs were composed of thrombi that were hypointense on T2WI and papillary endothelial proliferations that showed T2 hyperintensity and enhancement.
  
  
  CONCLUSIONS
  MRI of finger IPEH reveals well-demarcated subcutaneous masses with hypointensity or hypointense nodules with peripheral hyperintensity on T2WI, as well as peripheral enhancement. T1 hyperintense nodules, internal heterogeneity on T2WI, and septal enhancement are more common in IPEH of other locations.
authors.affiliation: Department of Radiology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, 93, Jungbu-daero, Paldal-gu, Suwon, Gyeonggi-do, 442-723, South Korea.
authors.forename: Jinkyeong
authors.initials: J
authors.lastname: Sung
authors.affiliation: Department of Radiology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, 93, Jungbu-daero, Paldal-gu, Suwon, Gyeonggi-do, 442-723, South Korea. jeeykim@catholic.ac.kr.
authors.forename: Jee-Young
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Hospital Pathology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, 93, Jungbu-daero, Paldal-gu, Suwon, Gyeonggi-do, 442-723, South Korea.
authors.forename: Changyoung
authors.initials: C
authors.lastname: Yoo
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D005385:Fingers / Q000473:pathology*; D005682:Gadolinium; D006390:Hemangioendothelioma / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D014463:Ultrasonography; D055815:Young Adult
chemical_list: D003287:Contrast Media; D005682:Gadolinium
keywords: Finger; Intravascular papillary endothelial hyperplasia; MRI