Juvenile xanthogranuloma is a relatively rare cutaneous tumor of histiocytic origin, occurring mainly in neonates, children, and young people in the first 2 decades of life. An occurrence in adults is rare. Very rare is also a “deep“ subcutaneous and intramuscular localization of this tumor that is called in such case as “deep juvenile xanthogranuloma.” A very uncommon variant of this tumor is the so-called mitotically active xanthogranuloma, which was described in the literature only in a single...