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Difficulty: EasyPhysical Examination Findings

Match the following classic ocular and pupillary physical examination findings with their most likely underlying etiology or clinical condition.

  • Small, irregular pupils that constrict to accommodation but do not react to lightLate-stage Treponema pallidum infection
  • Unilateral ptosis, miosis, and ipsilateral facial anhidrosisCervical sympathetic chain disruption
  • Pupil that paradoxically appears to dilate when a light is swung from the healthy eye to the affected eyeOptic nerve inflammation or damage
  • Unilaterally dilated pupil with a sluggish, delayed response to both light and near visionParasympathetic ciliary ganglion denervation

Answer

Argyll Robertson pupil matches late-stage neurosyphilis; Horner syndrome matches sympathetic chain disruption; Marcus Gunn pupil matches optic nerve damage; Adie pupil matches parasympathetic denervation.
Each classic physical exam finding uniquely maps to a distinct pathophysiological mechanism or etiology. Argyll Robertson pupils represent neurosyphilis. Horner syndrome indicates sympathetic pathway disruption. A Marcus Gunn pupil signifies afferent sensory loss via optic nerve damage. An Adie tonic pupil represents parasympathetic efferent loss.

Step-by-Step Solution

1
Analyze the description of the pupils that accommodate but do not react to light.
Identified as the Argyll Robertson pupil.
This is a pathognomonic physical examination finding for neurosyphilis.
2
Evaluate the triad of ptosis, miosis, and anhidrosis.
Identified as Horner syndrome.
Horner syndrome results from a loss of sympathetic innervation to the eye and face.
3
Assess the paradoxical dilation during the swinging flashlight test.
Identified as a relative afferent pupillary defect (Marcus Gunn pupil).
This indicates an afferent pathway lesion anterior to the optic chiasm, most commonly optic neuritis or severe optic nerve damage.
4
Identify the unilaterally dilated, sluggish pupil.
Identified as the Adie tonic pupil.
This is due to parasympathetic denervation at the ciliary ganglion, leading to poor pupillary constriction.

Key Concept

Neurologic and Ocular Physical Examination Findings
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Topics

Physical Examination Findings

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