Presentation
Incidental finding in a patient with a history of breast cancer on abdominal CT for restaging.
Patient Data
CT images show the presence of a large mass arising from the lower lobe of the right kidney. The mass is prevalent and hypoattenuating. The excretory phase shows the presence of tiny hyperdensities suggestive of vessels within a predominantly fat-containing mass.
Axial contrast-enhanced CT scan demonstrates an exophytic fat-containing mass (yellow arrow) that has arisen from the right kidney. Note the characteristic parenchymal defect (red arrow).
Ultrasound image confirms the presence of an exophytic hyperdense round mass arising from the lower pole of the right kidney.
Case Discussion
A case of an incidental renal angiomyolipoma, a benign neoplasm composed of smooth muscle cells, blood vessels, and adipose tissue in varying proportions. The majority are clinically silent and are most often detected incidentally. It is key that those with perinephric extension must be distinguished from a primary perirenal retroperitoneal liposarcoma.
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