Computed Tomography and Magnetic Resonance Imaging Findings and Differential Diagnosis of the Renal Oncocytoma

摘要

Objective: To discuss the imaging features of renal oncocytoma, and to improve the preoperative diagnostic accuracy. Methods: Radiology data of 16 renal oncocytoma patients were analyzed retrospectively. All the cases were confirmed by pathology. All patients underwentpre-contrast and multiple phase contrast scanning on multi-slice CT. The patients also underwent MRI examination. Results: All patients had solitary lesion, the location of oncocytoma were in right kidney (n = 9) and left kidney (n = 7). Round or round-like shape, clearboundary, protruding mass. Isodense or slightly higher density on CT pre-contrast scanning, among them, 2 cases developed into the renal sinus, 2 cases with calcification. 13 lesions showed obvious enhancement on the cortical phase, and on the medullary phase showed continuous enhancement.4 lesions showed segmental enhancement inversion and central stellate scar was found in 8 lesions. Bleeding, necrosis, cystic change or fatty change was rare. 9 lesions showed tortuous expansion of the support vessel on the cortical phase, 6 lesions with invasion to the perirenal fat tissue.In our study, 3 samples of lesions underwent MR examination, which showed iso/hypo-intensity on T1WI. On T2WI, 1 lesion showed slightly lower signal, 2 lesion showed mixed signal. Clear pseudocapsule was revealed in MR imaging. Enhanced scan showed mild continuous enhancement. Conclusion:Most of the oncocytomas showed certain characteristic imaging, multiple phase contrast scanning are helpful in the accurate preoperative diagnosis.