Fig. 21

Two examples of radiopaque foreign bodies, with intraorbital (a) and intraocular (b) location. a Sagittal reconstruction with bone algorithm showing an intraorbital hyperdense foreign body (a piece of a glass bottle) embedded in the orbital floor (white empty arrow). b Axial acquisition reconstruction with bone algorithm showing an intraocular foreign body causing beam hardening artefacts (metal fragments in a welder, due to an accident at work) (white empty arrow). c, d Show possible mimickers of foreign bodies: in c, bilateral scleral plaques visible as calcifications near the scleral insertion of the extraocular muscles (white arrows); bilateral presence of intraocular lens implants for previous cataract surgery, that are smaller, thinner and less dense compared to the normal lenses. In d, bilateral presence of drusen (white arrowheads), visible as focal calcifications in the optic nerve head