
This lesion on her knee had been present for 5 years, reported a 22-year-old woman. It was not related to any trauma; its size had not changed, but occasionally it became darker or lighter. Excisional biopsy revealed lymphangioma circumscriptum, a benign, hamartomatous malformation of dilated lymph channels that may be filled with clear fluid because of communication with deeper lymphatics or, as in this case, serosanguinous fluid.
























































































































































