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FIG 1. Calvarial thickening.
A, AROP. Sagittal T1-weighted MR image shows thickening of the calvaria and facial bones. Note hypointensity of skull and cervical vertebra, and cerebellar tonsillar ectopia.
B, ADOP I. Sagittal T1-weighted image shows calvarial thickening and hypointensity, as well as tonsillar ectopia.
C, ADOP II. Sagittal T1-weighted image shows only a moderately thickened calvaria; however, the skull base is more significantly thickened than in the example of ADOP I (B). Compare the small sellar volume with that in ADOP I (B).
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