False localising signs

Question 1

What are false localising signs?

Answer 1

Neurological signs that reflect pathology distant from the expected anatomical locus

Question 2

Which cranial nerve is famous for causing false localising signs?

Answer 2

Abducens - CNVI

Occurs in cases of raised ICP

The nerve gets stretched during its long course or is pressed against temporal bone

Question 3

When do false localising signs occur?

Answer 3

Raised ICP

Spinal cord lesions

Question 4

Third nerve palsy false localising cause

Answer 4

Uncal herniation

Question 5

Which cranial nerve palsies are associated with increased ICP?

Answer 5

Classically abducens (6th)

Also trigeminal (5th) and facial (7th)