Dear Editor, I have read the case report of Thomas et al with interest. The title of the report contains the term ‘diaphyseal achalasia’ to define multiple osteochondromatosis.1 This was also stated in the Introduction section.1 Multiple osteochondromatosis is also defined as ‘diaphyseal aclasis’.2 I would like to thank Thomas et al, however I would to conclude that the correct term for multiple osteochondromatosis is ‘diaphyseal aclasis’.