Choroidal detachment (traumatic)
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There is hyperdensity involving the periphery of the right orbit almost circumferentially, but with sparing of the posterior third. On the other hand the haemorrhage extends comparatively far anteriorly - closer to the length than the 2 and 10 o'clock positions, which is where the retina terminates (the ora serrata). These features indicate that there is a choroidal, rather than a retinal detachment.
Choroidal detachment results when fluid or blood accumulates in the sub-choroidal space. Features that distinguish it from a retinal detachment include:
- choroidal detachment tends to spare the region of the optic nerve and the posterior third of the globe. In contrast retinal detachment has its apex at the optic disc.
- choroidal detachment may extend further more anteriorly than the ora serrata (site of retinal attachment at 2 and 10 o'clock). In contrast retinal detachment is limited by this anterior site of attachment.
- on axial imaging, choroidal detachment has a shape reminiscent of a tennis ball*. A retinal detachment is typically V shaped.
* Note: the tennis ball analogy is a descriptive term only. To the best of my knowledge, there is no published literature describing a "tennis ball sign" of choroidal detachment, and an online search of the terms "tennis ball" and "choroidal detachment" yields results pertaining to aetiology rather than radiologic description.