A case is reported of basilar fracture of the occipital bone passing t
hrough the left occipital condyle, ascending the clivus anteriorly, wi
th marked medial displacement of the bony fragment. The injury produce
d ipsilateral palsies of nerves IX through XII (Collet-Sicard syndrome
). A CT scan accurately delineated the extent of the fracture. Partial
neurological recovery ensued following surgery.