title: Imaging findings of primitive neuroectodermal tumors of the kidney.
abstract: OBJECTIVE
  This study was designed to present the radiological imaging findings of a renal primitive neuroectodermal tumor (PNET).
  
  
  METHODS
  The study included 10 patients with pathologically proven renal PNETs. We assessed the size, margin, internal architecture, enhancement pattern, vein thrombosis, and presence of a metastasis of the tumors on multidetector-row computed tomography and magnetic resonance imaging.
  
  
  RESULTS
  The mean age of the patients was 31 years. Patients were predominantly male (males-females, 8:2). The mean diameter of a renal PNET was 12.7 cm. All masses were well defined with a lobulated contour. Necrosis and hemorrhage were detected in 9 cases, respectively. All of the masses showed weak heterogeneous enhancement with multiple irregular septumlike structures. Eight of the masses had renal vein thrombosis, and 4 masses had extension into inferior vena cava. A lymph node metastasis was detected in 3 patients. A lung metastasis was detected in 4 patients, and 2 of the patients also had a bone metastasis.
  
  
  CONCLUSIONS
  A renal PNET usually appears as a weakly enhanced large mass with multiple septumlike structures, peripheral hemorrhage, venous thrombosis, and accompanied with a distant metastasis in a young adult.
authors: Department of Radiology, Hallym University Sacred Heart Hospital, Seoul, Republic of Korea.
authors: Hyun
authors: H
authors: Lee
authors: Jeong Yeon
authors: JY
authors: Cho
authors: Seung Hyup
authors: SH
authors: Kim
authors: Dae Chul
authors: DC
authors: Jung
authors: Jeong Kon
authors: JK
authors: Kim
authors: Hyuk Jae
authors: HJ
authors: Choi
mesh_terms: D000328:Adult; D003287:Contrast Media; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018242:Neuroectodermal Tumors, Primitive / Q000473:pathology*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media