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Updated: Feb 8, 2026

Intravitreal Injections in the Ovine Eye
Published on: July 5, 2022
Vitreous opacities after intravitreal triamcinolone injection- a case report
Dhanashree Ratra1, Vineet Ratra2, Haard Shah3
1Department of Vitreoretinal Diseases, Medical Research Foundation, Sankara Nethralaya, 41, College Road, Chennai, 600006, India. dhanashreeratra@gmail.com.
Background:
We report occurrence of peculiar tiny white thread like vitreous opacities after intravitreal triamcinolone injection. These persisted without any change for over a year. We ascribe them to aggregation of triamcinolone crystals due to the purification methods.
Case Presentation:
Seven patients (8 eyes) with macular edema developed tiny whitish thread like opacities in the vitreous 2-3 months after undergoing an intravitreal injection of triamcinolone acetonide preparation containing benzyl alcohol as preservative. These opacities persisted unchanged for more than a year. The follow up ranged from 91 to 425 days. Vitreous tap was done in one patient which was negative for infection. All patients initially showed improvement but needed re-treatment for recurrence. One patient developed steroid induced rise in intraocular pressure. Microscopic examination of the drug revealed large string like aggregates of triamcinolone crystals.
Conclusions:
We hypothesize the possibility of aggregation of triamcinolone crystals into string like structures probably due to the purification methods used during manufacture which led to these thread like opacities in the vitreous.
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