title: [Computed tomography features and pathological correlations of primitive neuroectodermal tumor of the kidney].
abstract: OBJECTIVE
  To explore the computed tomography (CT) features and pathological correlations of primitive neuroectodermal tumor (PNET) of the kidney.
  
  
  METHODS
  The CT features of 5 cases of pathologically confirmed PNETs were retrospectively reviewed along with a literature review to analyze the CT features and pathological correlations.
  
  
  RESULTS
  The age range was 19-78 years. CT image showed solitary mass of heterogeneous density with ill-defined margins. One case had multifocal necrosis. Among 3 cases of cystic changes, there were mural nodule (n = 2) and patchy calcification (n = 1). Four cases showed invasive growth into renal cortex and pelvis with cortical interruption (n = 3) and destruction of renal capsule and invasion into perirenal fat space (n = 1). The tumors were confined to kidney contour with enlarged kidney (n = 3). All 5 cases showed slight heterogenous enhancement in cortico-medullary phase with persistent moderate enhancement (n = 4) and persistent mild enhancement (n = 1) in nephrographic phase.
  
  
  CONCLUSIONS
  Renal PNET is common in young patients with a high degree of malignancy. CT features include large mass with heterogenous density and poor-defined border confined within renal contour. Necrosis and cystic changes occur commonly with invasive growth. Persistent enhancement is found during nephrographic phase. A definite diagnosis is dependent upon pathological and immunohistochemical examinations.
authors.affiliation: Department of Radiology, Department of Pathology, First Affiliated Hospital, Zhengzhou University, Zhengzhou 450052, China.
authors.forename: Songwei
authors.initials: S
authors.lastname: Yue
authors.forename: Jingjing
authors.initials: J
authors.lastname: Xing
authors.affiliation: Email: cjr.gaojianbo@vip.163.com.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Gao
authors.forename: Junqiang
authors.initials: J
authors.lastname: Dong
authors.forename: Dandan
authors.initials: D
authors.lastname: Zhang
mesh_terms: D006801:Humans; D007668:Kidney; D007680:Kidney Neoplasms; D008279:Magnetic Resonance Imaging; D018242:Neuroectodermal Tumors, Primitive; D010388:Pelvis; D010808:Physical Examination; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed