Abstract
A 37-year-old man with a history of post-cholecystectomy and a known case of supra renal cystic lesion was referred for contrast-enhanced computed tomography of abdomen, where a supra-renal, well-defined, thick-walled cystic lesion with intense peripheral enhancement on arterial phase measuring 7 × 8.2 × 7.6 cm (anteroposterior × craniocaudal × transverse; Figure 1b) was seen replacing the right adrenal gland. Fat planes were relatively well-maintained. The Hounsfield Units (HU) were calculated in the lesion in phases (plain/pre-contrast, venous, and delayed; Figure 1) by taking the average value of the overall heterogeneous enhancement of the lesion and observing the washout patterns in the pre-contrast (55 HU; Figure 1a), venous (140 HU; Figure 1c) and delayed phases (100 HU; Figure 1d) and comparing them to the standard radiological features.
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