An Incidental Adrenal Tumor Found on Routine Contrast-Enhanced Abdominal CT

An incidental adrenal tumor found on routine contrast-enhanced abdominal CT:

A) is always a hormonally significant adrenal adenoma, and the patient likely has Cushing's disease.
B) requires CT-guided biopsy to determine if the lesion is malignant or benign.
C) may not be definitively evaluated on contrast-enhanced CT because unenhanced CT density of an adrenal lesion is an important issue.
D) should be evaluated further with radionuclide adrenal scanning.