A choroidal effusion is an accumulation of fluid in the supra-choroidal space (between the choroid and sclera). It differs from a retinal detachment in its clinical presentation and radiologic appearance.
Choroidal effusions can be associated with :
- ocular hypotony : small globe with a characteristic umbrella sign or scleral infolding
- ocular neoplasms
- inflammatory choroidal disorders
- caroticocavernous fistula
CT scans are useful in identifying the underlying cause, with features pertaining to each underlying disorder discussed in their respective articles.
Choroidal effusions appear as hypodense linear fluid collections elevating a thick hyperdense choroid.