Juvenile Xanthogranuloma: Presenting as an Isolated Renal Involvement.

Juvenile xanthogranuloma (JXG) is a histiocytic disorder of childhood that mostly affects the skin although extracutaneous and visceral manifestations are well documented in English literature. The renal involvement is less commonly documented as a manifestation of xanthogranuloma and the reported cases occur in conjunction with cutaneous xanthogranuloma, especially in association with multiple skin lesions. We present a case of isolated renal JXG presenting as a renal mass with perinephric soft tissue and muscle involvement but without any cutaneous manifestation. This is the first case report of renal JXG without cutaneous involvement, to the best of our knowledge.