DOI: 10.36347/sjams.2021.v09i06.010

Pages: 827-835

Aim: The purpose of our study is to evaluate the ability of MDCT to differentiate renal masses based on CT characteristics and location and differentiate benign from malignant masses. Results: The most common benign neoplasm was renal cortical cyst, Bosniak 1 category. Normal renal cortex showed greatest enhancement in the parenchymal phase.The most common malignant neoplasm was Clear cell RCC and most common infectious lesion was renal abscess. Statistical significance (p<0.005) amongst tumor groups were seen in age, tumor attenuation, tumor to kidney enhancement, mean absolute attenuation and de enhancement characteristics. Tumor to kidney enhancement ratios was indicative of how many times a tumor enhanced with respect to renal parenchyma and ranged from 0.0 for simple cystic lesions to 1.7 in malignant clear cell RCC. Statistical significance amongst tumor groups was seen between sex, lesion margins, calcification, lymphadenopathy, CT density and enhancement pattern. Presence of male gender, lymphadenopathy, a heterogeneous pattern of enhancement were factors in support of malignancy. A homogeneous pattern of enhancement, coarse calcification, regular tumor margins were consistent with benign etiology. The relative attenuation with adjacent renal cortex in vascular phase was maximum for clear cell RCC. Classical Angiomyolipoma were best diagnosed in the unenhanced phase with CT attenuation of <-10 HU, diagnostic of macroscopic fat. Lipid poor angiomyolipomas had unenhanced attenuation of >45 HU and a homogeneous parenchymal phase maximum enhancement.