Fourth nerve palsy

Fourth nerve palsy
Fourth nerve palsy
Classification and external resources

Trochlear nerve
ICD-10 H49.1
ICD-9 378.53
eMedicine oph/697
MeSH D020432

Fourth nerve palsy is a condition caused by weakness or paralysis of the superior oblique muscle. This condition often causes double vision as the weakened muscle prevents the eyes from moving in the same direction.

When present at birth, it is known as congenital fourth nerve palsy.

See also


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