Hereditary multiple exostosis

Abstract

Multiple Hereditary Exostoses (HME) is an autossomal dominant disorder that exhibits multiple benign osteocartilaginous bone tumours that arise near the ends of long bones during childhood. The most common complaint is pain and the exostoses may degenerate into chondrosarcomas. We report a female patient who underwent a rehabilitation program to ease her complaints caused by a large exostosis in the left femur and displayed an exostose of the nasal septa, feature never described before in HME. Molecular study confirmed a novel mutation on the EXT 1 gene. The mutation of a cytosine for a guanine nucleotide in the position 830 on the exon 1 of the EXT 1 gene (c.830C > G) caused the replacement of the serine aminoacid for a stop codon in the position 277 of the protein.