[Permanent jaw constriction of extra-articular origin].

The authors describe a new case of permanent constriction of extra-articular osseous origin. They consider the classical distinction between constrictions due to traumatism and those due to malformation (O. Jacob's disease) debatable, for this malformation is usually secondary to traumatism. They also think that the osteoma responsible for constriction may be considered a localisation of neurogenic para-osteoarthropathies.