title: Renal cell carcinoma with hemorrhagic cyst formation in a 4-year-old boy.
abstract: We report on a case of renal cell carcinoma (RCC) with hemorrhagic cyst formation in a 4-year-old boy. The patient presented with asymptomatic macrohematuria. Abdominal ultrasound, computed tomography and magnetic resonance imaging demonstrated a left renal complicated cyst, 18 mm in diameter. Renal malignancy was suspected, and left radical nephrectomy was performed. Pathological diagnosis was a complicated cyst filled with bloody clots, with a wall composed of RCC. No metastases to the regional lymph nodes or other organs were found. This is an extremely rare occurrence of such a small RCC that developed a hemorrhagic cyst in a boy of this young age. The boy is being followed-up without any additional treatment.
authors.affiliation: Department of Urology, Yao Municipal Hospital, Osaka City University Graduate School of Medicine, Osaka, Japan. takadmk5@silver.ocn.ne.jp
authors.forename: Takahisa
authors.initials: T
authors.lastname: Adachi
authors.forename: Tatuya
authors.initials: T
authors.lastname: Nakatani
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Minami
authors.forename: Sinichi
authors.initials: S
authors.lastname: Ikemoto
authors.forename: Kazuyosi
authors.initials: K
authors.lastname: Esaki
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Morimoto
authors.forename: Tosio
authors.initials: T
authors.lastname: Takase
mesh_terms: D018262:Adenocarcinoma, Clear Cell / Q000175:diagnosis* / Q000601:surgery; D000231:Adenocarcinoma, Papillary / Q000175:diagnosis* / Q000601:surgery; D002292:Carcinoma, Renal Cell / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D002675:Child, Preschool; D006470:Hemorrhage / Q000150:complications*; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000175:diagnosis / Q000601:surgery; D007680:Kidney Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D008297:Male; D009392:Nephrectomy