ABSTRACT.Purpose: To evaluate the causes of retinal detachment after silicone oil removal, to define possible risk factors and the anatomical and functional prognosis of this complication. Methods: 112 eyes that underwent silicone oil removal were included. The group of eyes with retinal detachment after oil removal (18/112 eyes, 16.1%) was compared with the group with no postoperative retinal detachment. Results: The most common cause for retinal detachment after oil removal was anterior PVR (77.8%). Initial PVR detachment, advanced PVR stages, anterior PVR, more preceding operations, aphakia/pseudophakia, myopia and shorter duration of the oil tamponade were significantly more represented in the group of eyes with retinal detachment after oil removal. The prognosis of retinal detachment after oil removal is poor. Conclusion: Some criteria could be regarded as risk factors for retinal detachment after silicone oil removal. Improvement of the results should be possible by considering these factors and by control of reproliferations.

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ABSTRACT.Purpose: To compare helical CT to conventional CT imaging in the assessment of orbital metallic foreign bodies with regard to image quality, scanning time, and radiation exposure. Methods: Twenty-four standardized metallic foreign bodies, placed into the orbit (anterior, epibulbar, posterior) of cadaver heads were studied. Helical CT scanning in the axial plane with multiplanar reconstruction of coronal and sagittal images was performed as well as conventional CT imaging with direct scanning in the axial and the coronal planes (Tomoscan SR 7000, Philips, The Netherlands). Two masked observers consensually graded the studies using 5 predetermined criteria. Radiation dose delivered to the lens and scanning time were measured for the helical and the conventional CT imaging workup. Results: Helical CT imaging scored statistically significantly better with regard to overall accuracy of foreign body localization and presence of beam-hardening streak artifacts from dental fillings. Conventional CT scored significantly better with regard to stair-step artifacts. The radiation dose delivered to the lens was 35.4 mGy for helical CT imaging and 73.9 mGy for conventional CT workup (axial and coronal scanning). Total scanning time was 18 seconds for helical CT axial scanning and 104 seconds for conventional CT axial and coronal scanning. Conclusion: Helical CT is superior to conventional CT imaging, because it can provide adequate information about orbital metallic foreign bodies with a single acquisition, thus reducing both the number of examinations and the radiation exposure for the patient.

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