Why is Sub-Hyaloid Hemorrhage ‘boat-shaped’?

-It is the accumulation of blood in the subhyaloid or retrohyaloid space i.e. between the ILM and posterior hyaloid causing a localised detachment of the vitreous from the retina.

-The hemorrhage is sharply demarcated because the hyaloid is attached in the region surrounding the hemorrhage.

-It begins as a circular shape and later becomes crescentic with a straight upper margin due to the effect of gravity giving it a boat shape.

-Source of blood: Retinal blood vessel capillaries

-Severe vision loss if it occurs in the macular area

Management:

-Observation

-Nd yag hyaloidotomy

-Pneumatic retinopexy with or without tissue plasminogen activator

-Pars plana vitrectomy

Image from Rajan Eye Care Hospital

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