Which imaging modality is recommended when evaluating a metallic intraocular foreign body?

• A. MRI
• B. Seidel's test
• C. CT scan
• D. B-scan

Answer: (C)

When a metallic intraocular foreign body is suspected, imaging should quickly and accurately reveal its presence, size, and exact location, along with any associated injuries. CT scan is the best choice because metal shows up as a bright signal on CT, providing precise localization within the globe or orbit and helping guide management. It also helps assess adjacent structures for additional damage. MRI, by contrast, is avoided in the presence of any metallic IOFB because the strong magnetic field can pull or heat the metal, risking further injury. Seidel’s test is not an imaging modality but a test for corneal wound leaks, so it doesn’t help in locating a foreign body. B-scan can evaluate the eye when the media is opaque, but it isn’t as reliable as CT for pinpointing a metallic object’s exact position and may miss small or deeply seated fragments.