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CT evaluation of plastic intraocular foreign bodies.

The high sensitivity of CT in detecting metallic orbital foreign bodies has been previously described [1-6] . While there has been some success in detecting glass fragments , detecting intraorbital foreign bodies made of wood has been very unsatisfactory [1, 2, 69]. Plastic orbital implants are easily recognized on CT as high-attenuation-value images [6, 7]. This report presents two cases of plastic foreign bodies within the globe that appeared as low-attenuation-value images. The studies were performed on a GE 8800 CT fT scanner, and the globe was evaluated by contiguous 1.5-mm axial sections obtained parallel to the canthomeatalline. The gantry was not angulated to facilitate multi planar reconstruction imaging. A phantom containing eight different types of plastics, having a wide range of appearance by CT, was used to further evaluate the appearance of plastic foreign bodies.