multiple exostoses

multiple cartilaginous exostoses, multiple osteocartilaginous exostoses 1. an autosomal dominant disorder characterized by exostoses near the ends of diaphyses of long bones, which may be cartilaginous or osteocartilaginous growths; it is generally benign, although sarcomatous changes have occurred. Called also diaphyseal aclasis and hereditary multiple e's. 2. a bone disease in dogs and sometimes cats, often hereditary, characterized by exostoses on bones such as ribs, long bones, or vertebrae. They may impinge on blood vessels, nerves, or the spinal cord; the latter case can cause paresis or paralysis.