Normal brain (MRI)

Case contributed by Frank Gaillard
Diagnosis not applicable


Vague headaches. Otherwise well.

Patient Data

Age: 20 years
Gender: Female

Normal appearance of a young person's brain on a 1.5T scanner other than borderline low-lying tonsils. Note, however, that McRae’s line (basion to the opisthion) needs to be measured A) in the midline and B) from the tip of the cortical bone - and not the fat-rich bone marrow. The tonsils are rounded (not peg-like) and, although no scale is present to effect a precise measurement, at most these tonsils are 2-4 mm below McRae's line and thus of dubious significance. Minor retroflexion of the odontoid process. No syrinx.

Case Discussion

Essentially normal MRI of the brain for reference. Borderline low-lying tonsils.

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