Oculomotor nerve schwannoma
Left third cranial nerve palsy
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A vividly enhancing nodule is in line with the oculomotor nerve, and most likely represents a schwannoma.
Although schwannomas most commonly affect the vestibular cochlear nerve (see acoustic schwannoma) they can involve any of the cranial nerves (except CN I and II). In this case oculomotor nerve is affected.
Histological proof is often not available for some of these tumours as until mass effect necessitates it, resection will result in a cranial nerve palsy and in this case diplopia etc...