NeuroradiologyChoroidal detachment
separation of sclera from subjacent choroid (or ciliary body, hence the term "ciliochoroidal detachment"). Choroidal detachments can be due to either serous effusions or haemorrhagic collections. Haemorrhagic choroidal detachment, or choroidal
haematoma, is usually related to
trauma or surgical intervention. Choroidal serous effusions are also commonly secondary to
trauma or surgery (vitreous) but they may also be secondary to
inflammation. In the great majority of ciliochoroidal effusions, ocular hypotony is present and, in fact, is thought to represent a significant contributory factor in the development of the effusion itself .
Choroidal detachment appears on MR as a collection in the wall of the globe. As opposed to retinal detachment which rarely extends beyond the ora serrata, choroidal detachment frequently extends anteriorly to the ciliary body. Paramagnetic effects on MR T1- and T2-weighted signals are displayed in the case of haemorrhagic collections. Choroidal effusions are CSF-like but may display high signal on T1-weighted images as a consequence of their high protein content.
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