Post-treatment MRI and CT showed new bony destruction near the basiocciput
area, as well as destruction of the narrow space and the cortex adjacent to the foramen magnum and associated new soft-tissue enhancement.
Results: The first finding was the presence of an unusual shallow incomplete median bony canal on the clivus in the basiocciput region.
There are very few studies in literature about the presence of a bony canal on the clivus on basiocciput.
Persistence of canal on basilar part of clivus is a rare congenital defect of skull base representing an embryological remnant depicting the cephalic end of the notochord and corresponds to the course of the notochordal canal in the basiocciput caudally.
The inferior aspect of basiocciput was examined for the occurance of precondylar tubercle which consisted of bony elevations ranging from ridges near the anterior end of occipital condyles to larger median or paramedian projections along the anterior margin of foramen magnum.
Accessory vertebral elements along the anterior margin of foramen magnum interposed between the basiocciput and atlas may reduce the circumference of the foramen or cause asymmetry.
Precondylar tubercles on the basiocciput of adult human skulls.
One month before our evaluation, a CT was performed at another hospital and showed an osteolytic lesion with infiltrative margins and heterogeneous contrast enhancement, primarily involving the central base of the skull and covering both the basisphenoid and basiocciput
The supraocciput, exocciput, and basiocciput
can be accurately measured to determine the degree of overcrowding.
The adenoid diameter (line A) is measured by a perpendicular line from point A' to the intersection with the straight line of the basiocciput
(line B), which can be identified in a lateral nasopharynx x-ray.
The primary component of the sella turcica is the sphenoid bone with a component from the basiocciput
The superior border is formed by the basisphenoid and basiocciput