Left frontal craniectomy with cranioplasty. Minor underlying post operative gliosis.
3cm round anterior midline isodense mass centred on the planum sphenoidale at the site of the olfactory groove, with avid symmetrical oedema.
Smaller similar lesion in the right temporal region close to the sphenoid wing.
Hyperostosis of the floor of the anterior cranial fossa, without bony destruction.