Raeder’s paratrigeminal neuralgia

Two essential components ¹⁾ :

1. unilateral oculosympathetic paresis (AKA partial Horner syndrome (HS); this usually lacks anhidrosis, and in this syndrome, possibly ptosis also)

2. homolateral trigeminal nerve involvement (usually tic-like pain, but may be analgesia or masseter weakness; pain, if present, must be tic-like and does not include e.g. unilateral head, face, or vascular pain)

Localizing value of syndrome: region adjacent to trigeminal nerve in middle fossa. The cause is often not determined, but may rarely be due to aneurysm ²⁾ compressing V1 with sympathetic.

Localizing value of syndrome: region adjacent to trigeminal nerve in middle fossa. The cause is often not determined, but may rarely be due to aneurysm ³⁾ compressing V1 with sympathetics.