Findings
Axial non contrast CT scan, T2 weighted, In-Phase and Out-of-Phase images reveal a small 2 cm hypodense right adrenal lesion showing mean attenuation of less than 10 HU with signal drop out on Out-of-Phase images.
Diagnosis
Adrenal adenoma
Summary
- Typical lipid rich adrenal adenomas appear as hypodense lesions with attenuation less than 10 HU in non-contrast scan.
- Chemical shift imaging is the most reliable for diagnosis especially when CT findings are equivocal.
- MR imaging demonstrates signal dropout on Out-of-Phase images in the majority of adenomas, and a drop in signal intensity of >16.5% is considered diagnostic for an adenoma.
- For lipid-poor lesions, the contrast washout rate can be calculated using CT adrenals. Adenomas typically have rapid contrast washout, whereas non-adenomas tend to wash out more slowly.
- Adrenal adenomas can be differentiated from metastasis in a known malignancy using CT and MRI features.
Further reads
Have a vision to collaborate?
Let's Connect
Try a complimentary trial to have a glimpse of our services
