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A 45-year-old man presented with nausea and new-onset headache. He had a history of congenital obstructive hydrocephalus due to Chiari II malformation, treated during infancy with a ventriculoperitoneal shunt. CT scan of head confirmed ventricular enlargement from shunt failure. Following shunt replacement, his symptoms resolved. MR scan of brain after the procedure showed that the ventricles had reduced in size, but there was an extensive callosal lesion, without diffusion restriction or contrast enhancement. The patient remained asymptomatic. Repeat MR scan of brain 2 weeks later showed the callosal abnormality …
Contributors FFdA and JLP: writing and editing the paper. FFdA, JLP, OGPB and DMCC discussing the case and reviewing the paper.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned: externally reviewed by Richard Edwards, Bristol, UK.