Isolated cranial nerve absence is a rare condition that can be diagnosed using high-resolution
cranial nerve magnetic resonance (MR) imaging. Thorough clinical examination with
proper knowledge of the course of cranial nerves may help diagnose this rare condition.
We describe two cases, one each of, isolated congenital absence of the third and seventh
cranial nerve with their clinical presentation. High-resolution T2-weighted MR imaging
was done in both patients which revealed absence of cisternal segment of the right-sided
third nerve and cisternal with canalicular segment of the right-sided facial nerve.
Keywords
isolated - cranial nerve - absence