A 30 year old male came with complains of unilateral blurred vision with floaters since 15 days. On examination, AC flare and cells were seen with 'headlight in fog' appearance on indirect ophthalmoscopy. Also, a single inflammatory focus of fluffy retinochoroiditis lesion is seen. What is the diagnosis ?
Cytomegalovirus retinitis
Toxoplasmosis chorioretinitis
Toxocariasis
Sarcoidosis
Answer- B. Toxoplasmosis chorioretinitisToxoplasmosis is caused by Toxoplasma gondii, an obligate intracellular protozoan.Symptoms: Unilateral acute or subacute onset of floaters, blurring and photophobia.'Spill-over' anterior uveitis is common. It may be granulomatous or resemble Fuchs uveitis syndrome; elevated IOP may develop.Vitritis may be severe and impair fundus visualization. 'Headlight in the fog' is the classic description of a white retinal inflammatory nidus viewed through vitritis.