Collier's sign (also known as Collier's tucked lid sign[1] or posterior fossa stare[2]) is bilateral or unilateral eyelid retraction. It is an accepted medical sign of a midbrain lesion, first described in 1927 …

Bilateral lid retraction (Collier sign), like convergence retraction nystagmus, is thought to be due to loss of the supranuclear input to the third nerve nucleus.

Nov 19, 2025 · bilateral lid retraction (Collier sign) – results from loss of supranuclear inhibitory input to levator palpebrae motoneurons in the oculomotor nuclear complex (probably via posterior …

Abnormalities of the eyelids are common in patients with dorsal midbrain syndrome and include eyelid retraction (Collier’s sign), lid lag and occasionally ptosis.

Jan 1, 2018 · Any lesion in the dorsal midbrain may produce the Collier sign including infectious, inflammatory, vascular, neoplastic, demyelinating, traumatic, toxic, and shunt malfunction or …

Collier's sign, also known as the posterior fossa stare or tucked lid sign, is a clinical sign that indicates a dysfunction in the midbrain, particularly involving the structures responsible for vertical gaze.

Aug 2, 2022 · Parinaud syndrome (also called Parinaud’s syndrome and dorsal midbrain syndrome) is a rare neurological disorder that causes upward gaze palsy (the inability to gaze upward). It can also …

Lid retraction in the primary position, which is called the Collier sign. Mechanism of Collier’s sign – damage to the levator inhibitory fibers at the posterior commissure.

Apr 8, 2020 · Collier’s sign (posterior fossa stare, Figure 1) is lid retraction in primary gaze seen with lesions involving the area of the rostral midbrain, aqueduct and posterior third ventricle, especially …

Collier's sign (also known as Collier's tucked lid sign [1] or posterior fossa stare [2]) is bilateral or unilateral eyelid retraction. It is an accepted medical sign of a midbrain lesion, first described in 1927 …