Superficial CNS hemosiderin deposition Infratentorial superficial CNS hemosiderin deposition 2025-05-03T09:32:30Z Infratentorial superfiicial siderosis A type of superficial CNS hemosiderin deposition that involves the cerebellum and brainstem, most commonly the superior vermis, quadrigeminal plate, and basal cerebral surfaces. Cerebellar atrophy, particularly the superior vermis and anterior cerebellar hemispheres, can also be seen on a computed tomography scan of the head. The MRI of the spinal cord may reveal myelomalacia, syringomyelia, owl-eyes, or snake-eyes signs. The most common etiology for classic or primary infratentorial superficial siderosis is spinal dural defects, often dural tears.