A medical condition involving abnormal enlargement or dilation of the diacoelia (second brain ventricle) or relating to cerebrospinal fluid disturbances.
From 'diacoelia' + the medical suffix '-osis' (condition, disease state). This clinical term describes pathological changes in the brain's ventricular system.
Diacoelosis is part of that family of brain disorders that frustrated early doctors because they could see the problem (fluid backing up) but couldn't really fix it until modern neurosurgery and shunts were invented—it's a word that carries the history of neurology's struggle to understand the brain.
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