title: Radiologic findings in renal oncocytoma.
abstract: The imaging findings of 36 renal oncocytomas in 32 patients were evaluated retrospectively. Twenty-two patients underwent ultrasound (US), 16 CT, 25 angiography, 19 urography, and 6 fine-needle biopsy. At US 8 of the oncocytomas were isoechoic, 7 hyperechoic, and 7 hypoechoic. The structure was homogeneous in 59% and nonhomogeneous in 41%. At plain CT 12 oncocytomas were homogeneously hypodense, 3 isodense, and one hyperdense. Contrast enhancement was homogeneous in 10 and inhomogeneous in 4 cases. A stellate scar was detected in one case, and in one case a contrast study was not performed. At angiography the oncocytomas were hypervascular in 21, hypovascular in 3 cases, and one was not detected. Nineteen of the tumors were well delineated. A spokewheel arterial pattern was detected in 3 tumors. The cytologic diagnosis was benign renal oncocytoma in 4 cases and highly suggestive of oncocytoma in 2 cases. We conclude that the homogeneity of a renal tumor at US and at CT may suggest the possibility of oncocytoma. US-guided fine-needle biopsy is a useful diagnostic tool in patients who need a precise presurgical diagnosis.
authors.affiliation: Department of Diagnostic Radiology, University Central Hospitals, Oulu, Finland.
authors.forename: T
authors.initials: T
authors.lastname: Tikkakoski
authors.forename: M
authors.initials: M
authors.lastname: Päivänsalo
authors.forename: A
authors.initials: A
authors.lastname: Alanen
authors.forename: M
authors.initials: M
authors.lastname: Nurmi
authors.forename: M
authors.initials: M
authors.lastname: Taavitsainen
authors.forename: P
authors.initials: P
authors.lastname: Farin
authors.forename: M
authors.initials: M
authors.lastname: Apaja-Sarkkinen
mesh_terms: D000236:Adenoma / Q000000981:diagnostic imaging*; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D014567:Urography