Relative Enhancement Ratio of Portal Venous Phase to Unenhanced CT in the Diagnosis of Lipid-poor Adrenal Adenomas
Yasunori Nagayama, T Inoue, Yuki Kato, Shota Tanoue, Masafumi Kidoh, Seitaro Oda, Takeshi Nakaura, Toshinori Hirai
Abstract
< .001). The sensitivities of the relative enhancement ratio were 100% (58 of 58 adenomas; 95% CI: 94, 100), 83% (52 of 63 adenomas; 95% CI: 71, 91), and 30% (three of 10 adenomas; 95% CI: 7, 65) for adenomas measuring unenhanced attenuation of more than 10 HU up to 20 HU, 21-30 HU, and more than 30 HU, respectively. Conclusion A relative enhancement ratio threshold of greater than 210%, measured at unenhanced and portal venous phase CT, accurately differentiated lipid-poor adenomas from nonadenomas, particularly for lesions with unenhanced attenuation of 10-30 HU. © RSNA, 2021
Topics & Concepts
MedicineRadiologyNuclear medicineAdrenal and Paraganglionic TumorsCancer, Hypoxia, and MetabolismHormonal Regulation and Hypertension