Sunday, December 4, 2011
The sphenooccipital synchondrosis is the cartilagenous space between the basal portion of the sphenoid and occipital bones. Radiographs of the open synchondrosis reveal a lucent band 1 to 3 mm in width across the clivus at the level of the petrous apex. It usually closes by the age of 25. Ossification starts above and proceeds down, and is usually evident on radiographs as superior narrowing around the age of 13.