Cystic lymphangioma is a rare type of tumor of the lymphatic system, benign and typical during infancy, and are generally congenital. They are basically dilated lymph nodes with an endothelial covering, and serous or chylous contents. This tumor is located in the neck in 75% and axilla in 20% of cases. Involvement of the upper limb and particularly the elbow is very rare. We report on a case of macrocystic lymphatic malformation localized at the elbow. It was a 14 years old adolecent. Was followed up in our department because of congenital subcutaneous soft, painless mass of the left elbow. Ultrasonography and CT scan were evocative of the diagnosis of macrocystic lymphatic malformation. Surgical resection was complete without postoperative recurrence.