Isolated 3rd nerve palsy is Seen in-
*Diabetes ,hypeension and vascular disease are major risk factors *Isolated nuclear oculomotor palsy is rare. Third nerve palsy typically manifests as diplopia and ptosis.The diabetic 3rd nerve palsy may affect isolated superior or inferior division of the oculomotor nerve, but diplopia usually exists Ref Harrison20th edition pg 2456
Frontal lobe tumour
Webers syndrome
Diabetes
Lateral medullary syndrome
C.N.S