Uveitis: toxoplasmosis: practice question

A Ophthalmology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Ophthalmology · Uveitis: toxoplasmosis

Sample item

A patient has blurred vision with a white fluffy retinal lesion adjacent to an old pigmented scar and overlying vitritis, described as a headlight in the fog. What is the likely organism?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Toxoplasma gondii

Toxoplasma retinochoroiditis shows focal necrotising retinitis next to an old satellite scar. Treatment includes pyrimethamine with sulfadiazine, or trimethoprim-sulfamethoxazole, with steroids.

Option by option

  • A. Treponema pallidum

    Syphilis causes varied posterior uveitis.

  • B. Toxoplasma gondii (correct)

    Correct. A new lesion next to an old scar is the classic pattern.

  • C. Cytomegalovirus

    CMV retinitis occurs in immunosuppressed patients with haemorrhagic necrosis.

  • D. Toxocara canis

    Toxocara causes a granuloma in children.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is B, Toxoplasma gondii. Toxoplasma retinochoroiditis shows focal necrotising retinitis next to an old satellite scar.

Why is "Treponema pallidum" not the answer?

Syphilis causes varied posterior uveitis.

Why is "Cytomegalovirus" not the answer?

CMV retinitis occurs in immunosuppressed patients with haemorrhagic necrosis.

Why is "Toxocara canis" not the answer?

Toxocara causes a granuloma in children.

What concept does this question test?

It tests Uveitis: toxoplasmosis in Ophthalmology. Treatment includes pyrimethamine with sulfadiazine, or trimethoprim-sulfamethoxazole, with steroids.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Uveitis: toxoplasmosis?

Group the red eye by what to examine and what the pupil does. Then use the flashcards and the other Ophthalmology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.