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A well-circumscribed non-enhancing ovoid pineal mass measures 2.0 x 1.7 x 1.1 cm and distorts the upper tectum, mildly narrowing the upper aqueduct, with no associated signal abnormality or obstructive hydrocephalus.
Note is made of a right trigeminal artery, which is moderately tortuous, but without overt sacular aneurysm. Corresponding hypoplasia of the basilar artery proximal to the trigeminal artery is also shown.