Tympanic plate fracture following mandibular trauma.

Bleeding from the external auditory canal following head trauma is not unusual. It can be caused by a posterior dislocation of the mandibular condyle associated with a fracture of the tympanic bone. Although posterior dislocation is uncommon, it is the second most frequent complication after antero-medial displacement of the condyle.

Agenesis of sphenoid sinus. Case report.

Although the sphenoid sinuses can be identified in sections of the fetus at 4 months, at birth the sinus remains small and is little more than an evagination of the sphenoethmoid recess. After the 3rd year, invasion of the sphenoid bone is more rapid, and by the age of 7, the sinus has extended posteriorly to the level of the sella turcica. By the age of 12, the sphenoid pneumatization reaches its final form and a size equivalent to the adult, although further enlargement into the basisphenoid may occur in the adult.