Renal oncocytoma other imaging findings
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Homa Najafi, M.D.[2]
Overview
There are no other imaging findings associated with [disease name].
OR
[Imaging modality] may be helpful in the diagnosis of [disease name]. Findings on an [imaging modality] suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].
Other Imaging Findings
Renal angiography
Renal angiography may be helpful in the diagnosis of renal oncocytoma. Findings on an angiography which are suggestive of renal oncocytoma include:
- a lucent rim sign, a homogeneous capillary nephrogram phase, the absence of wild neoplastic vessels, and the “spokewheeled” appearance of the feeding arteries
- [Finding 2]
- [Finding 3]
Renal angiography was used historically to evaluate renal tumor arterial anatomy and examine intratumoral vascular patterns, but this modality has largely been supplanted by less morbid and invasive techniques such as CT angiography and magnetic resonance (MR) angiography. A number of typical angiographic signs have been described, including a lucent rim sign, a homogeneous capillary nephrogram phase, the absence of wild neoplastic vessels, and the “spokewheeled” appearance of the feeding arteries [34]. Nevertheless, these features significantly overlap with those observed with RCC, and as a consequence renal angiography cannot be recommended to distinguish between RCC and oncocytoma.
Angiography is potentially useful for the diagnosis of oncocytoma. The characteristics attributable to oncocytomas include the “spoke-wheel” appearance resulting from vessels radiating toward the center of the lesion, a homogenous capillary blush during the nephrogram phase, and an enhanced rim around the perimeter of the lesion.7–10,45 However, the features are not consistently found and the presence of the “spoke-wheel,” thought to be the most distinguishing quality on angiography, is seen in 4% to 76% of the tumors.9,10 Additionally, oncocytomas can appear either hypovascular or hypervascular on angiography.8,9
Renal angiography of many oncocytomas shows hypervascularity (Merino and Livolsi, 1982; Morra and Das, 1993). Typically, the vascularity displays a spoked wheel pattern (Alanen et al., 1984; Morra and Das, 1993; Harmon et al., 1996).