Corpus callosum impingement syndrome

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...