J Neurol Neurosurg Psychiatry 1999;66:357-364 ( March ) full text
Basilar impression complicating osteogenesis imperfecta type IV: the clinical and neuroradiological findings in four cases
OBJECTIVES To describe the clinical and neuroradiological features of basilar impression in patients with osteogenesis imperfecta type IV. METHODS Four patients with basilar impression were ascertained in a population study of osteogenesis imperfecta. All four had detailed clinical and neuroradiological examination with both CT and MRI of the craniocervical junction andposterior fossa structures. RESULTS All four showed significant compression of the posterior fossa structures and surgical decompression was performed with relief of symptoms. CONCLUSION Symptoms of cough headache and trigeminal neuralgia occurring in patients with osteogenesis imperfecta are indications for detailed clinical and neuroradiological investigation to document basilar impression.

American Journal of Neuroradiology 26:89-92, January 2005 Full text
METHODS: We retrospectively evaluated midline sagittal MR images in 200 adults and 50 children.
CONCLUSION: Both the standard and modified MR imaging techniques produced basal angles lower than those previously reported with standard radiography. The modified technique uses clearly featured landmarks that can be reproduced consistently on midline sagittal T1 images. This technique and its corresponding values can be used as the new standard for evaluating the basal angle.

European Neurology 2007;58:62-64 (Full text) Historical Note:Descriptions of the flattening (platybasia) of the skull base and the upward displacement(impression) of the basilar and condylar portions of the occipitalbone by the upper cervical spine date to the late 18th and early 19th centuries. Anatomical measurements to display these abnormalities were begun in 1865, but the full clinical significance was not appreciated until Homen's work in 1901. Subsequent refinement of radiology facilitated diagnosis and the later advent of surgical treatment.

Search String allintitle: platybasia OR (basilar (impression OR invagination)) 519 returns July 2007 (title search only)

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