Objective To explore the CT and MRI characteristics of renal hemangioma and to improve the diagnostic efficacy for such tumors.

Methods The clinical data of 10 patients with renal hemangioma approved by pathological were respectively analyzed. 3 patients underwent CT scanning, 5 patients underwent MRI, and 2 patients underwent both CT and MRI. The imaging characteristics of renal hemangioma were summarized.

Results There were 7 patients with anastomosing hemangioma. 6 lesions were located in the renal medullary and 3 in the renal sinus, 1 in the parenchyma. Maximum diameter ranged from 1.4 to 6.4 cm. 8 lesions showed round shape. All lesions were shown as mainly solid, and 3 owned capsule. Of the 7 lesions performed MRI, 4 showed obvious high signal intensity on T₂WI stage, 6 showed high signal intensity on DWI image; 3 showed equal signal intensity on ADC image and high and low signal intensity all performed in 2 lesions. 8 patients showed obvious nodular or patchy enhancement around the tumor in the corticomedullary phase (CMP), and with the character of "filled in" in the later stage. The enhancement rate of renal hemangioma in the nephrographic phase (NP) was higher than the abdominal aorta on CT (P < 0.05), but there was no difference on CMP. The enhancement rate of the renal hemangioma was no difference with renal cortex and abdominal aorta on MRI.

Conclusions Renal hemangiomas more perform anastomosing hemangioma and mostly local on medullary or sinus. With characteristics of high signal intensity on the T₂WI stage, nodular enhancement around the lesion in the CMP and progressive centripetal filling are performed over time and the enhancement intensity is similar to the abdominal aorta or renal parenchyma.