Abstract
The presence of macroscopic fat on computed tomography (CT) imaging has been traditionally regarded as an indication that an adrenal lesion is likely to be a benign myelolipoma, for which further investigation is not usually required. Two cases are described where an adrenal lesion was eventually found to be malignant on histology (adrenocortical carcinoma in the first case, undifferentiated sarcoma in the second case), despite the presence of macroscopic fat on CT. In both cases there were other clinical and radiological indicators of potential malignant pathology. These cases add to increasing awareness in the literature that malignant adrenal tumors may rarely contain macroscopic fat, emphasizing a need for clinical vigilance.
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