A 23-year-old white male who is otherwise in good health noted a sudden shower of flashing lights before his left eye a few hours ago. He has never had this symptom before. The most likely diagnosis is?

1. A

   Temporal lobe tumor

2. B

   Vitreous floaters

3. C

   Retinal detachment

4. D

   Migraine syndrome

Appeared in: UPUMS Nsg.Officer-2024

Explanation

• The patient's symptom of a 'sudden shower of flashing lights' (photopsia) in a single eye is a hallmark sign of retinal traction.
• This traction occurs when the vitreous humor pulls on the retina, which can create a tear.
• Once a tear develops, fluid can pass through it and lift the retina off the back of the eye, causing a retinal detachment.
• This condition is an ophthalmologic emergency because delayed treatment can lead to irreversible vision loss.

Why Other Options Were Wrong

• Option A: A temporal lobe tumor typically causes visual field defects (e.g., superior quadrantanopia or 'pie in the sky' defect) or complex, formed visual hallucinations, not unformed flashes of light.
• Option B: While vitreous floaters are caused by vitreous degeneration and can be associated with flashes, the term alone does not capture the urgency. A 'shower' of flashes is a red flag for a retinal tear, which is a precursor to detachment.
• Option D: A migraine aura is typically bilateral, builds up over 5-20 minutes, and has a characteristic pattern (e.g., scintillating zigzag lines). The patient's sudden, unilateral shower of flashes does not fit this description.

Related Visual

Clinical Relevance

• Nursing practice connection: Safe nursing care depends on performing Differential diagnosis of acute-onset photopsia (flashing lights) in the correct sequence, documenting the action clearly, and monitoring for the expected response.
• A nurse encountering a patient with a sudden onset of flashing lights and/or a shower of floaters must recognize this as a potential ophthalmologic emergency.
• The priority nursing action is to facilitate an immediate referral to an ophthalmologist for a dilated fundus examination to rule out a retinal tear or detachment.
• Patient education should include instructions to avoid strenuous activity and any actions that could cause rapid eye movement or jarring of the head until evaluated.

How to Approach the Question

• First, identify the key clinical features in the stem: the symptom is a 'sudden shower of flashing lights' (photopsia).
• Note the unilaterality ('left eye') and the acute onset ('a few hours ago').
• Systematically evaluate each option against these key features.
• Eliminate 'Migraine syndrome' because its aura is typically bilateral, has a distinct pattern (zigzag lines), and a slower onset.
• Eliminate 'Temporal lobe tumor' as it causes field cuts or formed hallucinations, not unformed flashes.
• Differentiate between 'Vitreous floaters' and 'Retinal detachment'. While related, the 'shower of flashes' is a classic red flag for a retinal tear, making retinal detachment the most critical and likely diagnosis to consider.

Concept Tested & Keywords

• Concept Tested: Differential diagnosis of acute-onset photopsia (flashing lights).
• Stem keywords: sudden shower of flashing lights, left eye, 23-year-old, new symptom
• Lead-in keywords: most likely diagnosis
• Clinical cues: The acuity ('sudden') and specific nature ('shower of flashing lights') of the symptom are critical clues pointing towards a retinal event.

Question ID

QyZs58ewWmRHOa_XT1YpjB

Copy ID

Reference Book

E6 Medicine Harrison 22e Part 1 p. 271-273