Renal cell carcinoma attenuation values on unenhanced CT: importance of multiple, small region-of-interest measurements

Renal cell carcinoma attenuation values on unenhanced CT: importance of multiple, small... Key words: CT—Renal cell carcinoma— Objective: Since it has been suggested that benign renal Kidney—Enhanced CT—Hounsfield units cysts can be diagnosed at unenhanced CT on the basis of homogeneity and attenuations of 20 HU or less, we determined the prevalence of renal cell carcinomas The diagnosis of renal masses has historically required (RCCs) with these characteristics using two different either ultrasound, or a CT or MRI examination that is methods of measuring attenuation. designed to evaluate a renal mass completely [1, 2]. Materials and methods: After IRB approval, two radiol- However, renal masses are more commonly found inci- ogists obtained unenhanced attenuation values of 104 dentally with imaging exams that are not designed to RCCs (mean size 5.6 cm) using a single, large region of evaluate them completely [3]. For example, unenhanced interest (ROI), two-thirds the size of the mass. They were CT, used often to evaluate a variety of abdominal dis- then determined if the masses appeared heterogeneous. orders, including flank pain and urolithiasis [4], often Of RCCs measuring 20 HU or less, those which appeared reveals incidental renal masses and thus radiologists are homogeneous were re-measured with multiple (6 or challenged with diagnosing their etiology. The primary Abdominal Radiology Springer Journals

Renal cell carcinoma attenuation values on unenhanced CT: importance of multiple, small region-of-interest measurements

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Springer US
Copyright © 2017 by Springer Science+Business Media New York
Medicine & Public Health; Imaging / Radiology; Gastroenterology; Hepatology
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