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Photo Essay
October 2004

Visualization of the Cloquet Canal During Triamcinolone-Assisted Vitrectomy

Arch Ophthalmol. 2004;122(10):1564. doi:10.1001/archopht.122.10.1564

A 51-year-old Japanese man visited us with visual loss in his righteye. A slitlamp and ophthalmoscopic examination of the eye revealed a mildcataract and a subhyaloid hemorrhage caused by a retinal macroaneurysm. Astandard phacoemulsification and pars plana vitrectomy (PPV) was performed.A triamcinolone acetonide (Kenakolt-A; Bristol Pharmaceuticals KK, Tokyo,Japan) suspension was gently injected into the anterior vitreous with a 27-gaugeneedle at the early stage of PPV.1 Immediately,a white tubelike structure appeared, extending from the retrolental spaceto the optic nerve head (Figure 1).This structure was a vitreous-free space filled with triamcinolone, and wasassessed to be a Cloquet canal. This structure disappeared after removal ofthe surrounding vitreous gel. Six months after surgery, the visual acuityimproved to 20/20.

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