Congenital Hypertonia of the Temporalis Leading to Trismus Since Birth.

Congenital trismus is quite rare especially when its etiology is not the usual. In our case report an 8 year old female patient with no history of forcep delivery, no history of trauma or infection and a non syndromic presents with trismus since birth. After thorough examination we could conclude that the cause is due to hypertonia of the temporalis muscle and its etiology is discussed.