Osteochondromatosis and the coronoid- zygomatic pseudojoint [Jacob's disease] as an unusual cause of midfacial asymmetry and jaw restriction

ABSTRACT

A young male presenting with a history of progressive midfacial symmetry and limitation of mouth opening was found to have a unilateral coronoid hyperplasia forming an osteochondromatous pseudojoint with the expanded zygomatic arch [Jacob's disease]. This paper reviews the differential diagnoses of problems, especially in developing countries, that can cause restricted mouth opening, highlighting problems with conventional radiography and the role of CT assessment in the diagnosis of this rare condition