title: MRI of intracranial chordomas. Extent of tumour and contrast enhancement: criteria for differential diagnosis.
abstract: We present six proven cases of chordoma of the clivus studied by CT and MRI, with special attention to the extent of the tumour and to the signal intensity after intravenous gadolinium. MRI is the best technique for assessing the extent of the tumour but CT is important for showing osteolysis. Our aim was to determine differential diagnostic neuroradiological criteria. Reliable signs of chordoma of the skull base are: posterior extension to the pontine cistern; a lobulated, "honeycomb" appearance after gadolinium: the swollen appearance of the bone in the early stages; bone erosion on CT and frequent extension to critical structures such as the circle of Willis, cavernous sinuses and brain stem.
authors.affiliation: Department of Neuroradiology, CHU Timone, Marseilles, France.
authors.forename: V
authors.initials: V
authors.lastname: Doucet
authors.forename: P
authors.initials: P
authors.lastname: Peretti-Viton
authors.forename: D
authors.initials: D
authors.lastname: Figarella-Branger
authors.forename: L
authors.initials: L
authors.lastname: Manera
authors.forename: G
authors.initials: G
authors.lastname: Salamon
mesh_terms: D000328:Adult; D000368:Aged; D002817:Chordoma / Q000175:diagnosis*; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D005682:Gadolinium; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis; D019292:Skull Base Neoplasms / Q000175:diagnosis*
chemical_list: D003287:Contrast Media; D005682:Gadolinium