Angiographie Patterns in Renal Oncocytomas

Abstract

Renal oncocytomas are benign tumors arising from proximal tubular epithelial cells. They appear radiographically as solid masses which are vascular on angiography. Angiograms of 13 cases of renal oncocytomas were reviewed, as well as those of 155 renal-cell carcinomas. The classic angiographic findings for the oncocytoma include a spoke-wheel pattern, a homogeneous nephrogram, and a sharp, smooth rim. The finding of a homogenous blush and/or a spoke-wheel pattern greatly increases the possibility of an oncocytoma, though a renal-cell carcinoma may have any or all of the classical findings described for an oncocytoma.

Renal oncocytoma: sonographic analysis of 14 cases

“…Various descriptions of the angiographic [3][4][5][6][7] and computed tomographic (CT) [3,8,9] We sought specific characteristics that might help to distinguish oncocytoma from renal cell carcinoma.…”

Renal Oncocytoma Developed in a Long-Term Hemodialysis Patient

“…Exact diagnosis cannot be obtained by laboratory data, IVP, sonography or CT scan, except for angiography which may give suggestive evidence through the findings of a spoke-wheel pattern or a homogeneous blush [7], In our case, which was incidentally discovered by an abdominal echogram, the angiography demonstrated hypervascularity and tumor staining and failed to determine the renal oncocytoma preoperatively. Renal oncocytomas with cystic transfor mations or those which have developed in cystic kidney disease have been reported [8,9].…”

Renal Oncocytoma in Transplant Patients: Report of 2 Cases

“…The term oncocytoma was coined after the description of oncocytes by Hamperl ( 11] in 1962. Radiographically, renal oncocyto mas appear as solid masses which arc vascular on angiog raphy; the findings include a spoke-wheel pattern, a ho mogeneous nephrogram, and a sharp, smooth rim [12], Nevertheless, renal cell carcinomas may also have these features. The following characteristics serve to distinguish between renal adenocarcinomas and oncocytomas: (1) visu ally oncocytomas are well circumscribed and characterized by a uniform tan color and the absence of hemorrhage and necrosis: (2) histologically they consist of oncocytes with mitochondrial activity; (3) ultrastructurally they exhibit cells with mitochondria, paucity of other organelles, and fat vacuoles; (4) clinically the tumor is usually asymptomatic and is inadvertently detected while addressing other prob lems during intravenous pyelography or CT scanning, and (5) the tumor has a favorable clinical prognosis |9], Never theless, this last point is controversial because cases of invasive renal oncocytomas have been reported [13].…”