Imaging findings of primitive neuroectodermal tumors of the kidney.
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.
Lee
Hyun
H
Department of Radiology, Hallym University Sacred Heart Hospital, Seoul, Republic of Korea.
Cho
Jeong Yeon
JY
Kim
Seung Hyup
SH
Jung
Dae Chul
DC
Kim
Jeong Kon
JK
Choi
Hyuk Jae
HJ
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
D003287:Contrast Media