A 66-year-old woman is found to have an incidental 5 x 4 x4 cm left upper pole renal mass on imaging performed for transient abdominal pain.
The lesion demonstrates evidence of macroscopic fat and is consistent with a renal angiomyolipoma (AML).
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AMLs are non-malignant renal lesions. Approximately 10% are associated with tuberous sclerosis (TS). Lesions found in TS patients demonstrate more rapid growth kinetics than sporadic masses.
Angioembolization, nephron-sparing surgery, and, more recently, ablation techniques are viable treatment options. Only lesions >4 cm require interventions, as these lesions are at highest risk for significant spontaneous hemorrhage.
The case was prepared by Alexander Kutikov, MD, FACS, Associate Professor of Urologic Oncology, Fox Chase Cancer Center, Philadelphia.