[Rare complications with multiple hereditary cartilaginous exostosis (author's transl)].

A case of hereditary multiple cartilaginous exostosis is reported and the clinical symptoms are discussed. An exostosis of the distal femur was followed by an aneurysma spurium of the left femoral artery. Osteochondromas of the left ribs caused a hematothorax. Thoracotomy was necessary for treatment.