title: Unusual renal cell carcinomas: a pictorial essay.
abstract: Renal cell carcinoma (RCC) is the most common solid renal neoplasm. Clear cell (conventional) carcinoma is the most common pathologic subtype of RCC. Usually RCC is a hypervascular, solid, solitary mass with contour bulging. However, RCC can manifest different features according to the pathologic tumor subtypes. Preoperative diagnosis of cyst-associated RCC is very difficult, especially in cases of RCC originating in a cyst. Multiple or bilateral presentation of RCC occurs in fewer than 5% of cases. In addition, RCCs may demonstrate unusual findings such as infiltrative growth mimicking transitional cell carcinoma, fatty component mimicking angiomyolipoma, severe perinephric infiltration, and extensive calcifications mimicking inflammation or other tumor. RCCs can be associated with hereditary diseases such as von Hippel-Lindau disease. Familiarity with these radiologic features of unusual RCCs can help ensure correct diagnosis and proper management.
authors.affiliation: Department of Radiology, Korea University Guro Hospital, 97 Gurodong-Gil, Guro-Ku, Seoul 152-703, Korea.
authors.forename: K A
authors.initials: KA
authors.lastname: Kim
authors.forename: J W
authors.initials: JW
authors.lastname: Choi
authors.forename: C M
authors.initials: CM
authors.lastname: Park
authors.forename: C H
authors.initials: CH
authors.lastname: Lee
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
authors.forename: D K
authors.initials: DK
authors.lastname: Yoon
authors.forename: H Y
authors.initials: HY
authors.lastname: Seol
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002292:Carcinoma, Renal Cell / Q000145:classification / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology; D007680:Kidney Neoplasms / Q000145:classification / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008488:Medical Illustration; D008875:Middle Aged; D014057:Tomography, X-Ray Computed / Q000379:methods; D014463:Ultrasonography