MAFFUCCI'S SYNDROME is so rare in the average surgical and orthopedic practice we thought we would like to add this one case to the literature. This case reveals so many interesting findings and problems we thought it would be of particular interest to the general surgeon and the orthopedic specialist. Report of a Case This patient was first referred to one of us (W.G.C.) by her pediatrician April 19, 1954, when she was 10 years of age. She was referred mainly for the removal of a dark thickened tumor-like area on the thenar eminance of the right hand and a cyst-like lesion on the inner surface of the upper right arm. She was admitted to St. Joseph Hospital where on April 26, 1954, she was operated on under general anesthesia. The lesions of the right hand and upper right arm area were removed and the pathological diagnosis of both lesions,