Parinaud syndrome

PARINAUD'S SYNDROME---( dorsal midbrain syndrome)
Supranuclear vertical gaze disorder caused by damage to the posterior commissure.
Causes include hydrocephalus from aqueductal stenosis,pineal region tumors, cysticercosis, and stroke.
Features include loss of upgaze, convergence-retraction nystagmus on attempted upgaze, downward ocular deviation ("setting sun" sign), lid retraction (Collier's sign), skew deviation, pseudoabducens palsy, and light-near dissociation of the pupils
PARINAUD'S OCULOGLANDULAR SYNDROME--- Granulomatous conjunctivitis, swollen painful preauricular lymph nodes
Causes include infections like Bartonella henselae,Francisella tularensis..