title: Ossifying renal tumor of infancy: findings at ultrasound, CT and MRI.
abstract: A 4-month-old boy presented with persistent gross hematuria. At ultrasonography, a 3.5-cm echogenic mass with posterior shadowing and tumor vascularity was detected within the right renal pelvis. Precontrast CT showed a slightly hyperattenuating mass in the renal pelvis. At MRI the mass was heterogeneously hypointense on T2-weighted images and isointense on T1-weighted images. Contrast-enhanced CT and MRI both revealed peripheral enhancement of the mass. A histological diagnosis of ossifying renal tumor of infancy was made after open pyelostomy and tumor enucleation. We suggest that ossifying renal tumor of infancy should be considered when a mass with posterior acoustic shadowing and tumor vascularity on US, hyperattenuation on precontrast CT and hypointensity on T2-weighted MRI is seen within the renal pelvis of an infant with hematuria.
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, 28 Yongon-Dong, Jongno-Gu, Seoul, 110-744, Republic of Korea.
authors.forename: Sang Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Young Hun
authors.initials: YH
authors.lastname: Choi
authors.forename: Woo Sun
authors.initials: WS
authors.lastname: Kim
authors.forename: Jung-Eun
authors.initials: JE
authors.lastname: Cheon
authors.forename: Kyung Chul
authors.initials: KC
authors.lastname: Moon
mesh_terms: D003937:Diagnosis, Differential; D003952:Diagnostic Imaging / Q000379:methods*; D006801:Humans; D007223:Infant; D007680:Kidney Neoplasms / Q000150:complications* / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009999:Ossification, Heterotopic / Q000175:diagnosis* / Q000209:etiology*; D014057:Tomography, X-Ray Computed / Q000379:methods; D014463:Ultrasonography / Q000379:methods