A case of pararenal angiomyolipoma arising from an existing exophytic angiomyolipoma
A 52-year-old healthy woman with a congenital solitary right kidneypresented with an incidentally found pararenal mass. Computedtomography and magnetic resonance imaging revealed an exophyticmass in the right kidney consistent with an angiomyolipoma and anadditional enhancing pararenal mass that contained fatty elements.Differential diagnosis of the mass included liposarcoma and angiomyolipoma.Upon exploration, the exophytic angiomyolipoma wasfound to be contiguous with the pararenal mass via an isthmus offatty tissue. Frozen sections were taken from both masses which confirmedthat both were angiomyolipoma. This is the first case reportedin the literature wherein an angiomyolipoma extended extrarenallyand formed a significantly larger pararenal mass.