Which of the following is NOT recommended when managing a metallic intraocular foreign body?

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

Answer: (D)

Metallic intraocular foreign bodies interact with strong magnetic fields in MRI, which can cause the object to move or torque inside the eye and even heat up, potentially damaging ocular tissues. Because of this risk, MRI is avoided when a metallic IOFB is present or suspected until its composition is known and the object is removed if needed.

CT scanning is the imaging modality of choice for localizing a metallic IOFB because it precisely shows the object's size, location, and relation to surrounding structures, which is essential for planning removal. B-scan ultrasound is useful when the ocular media are opaque and you still need information about the posterior segment and the presence of the foreign body, though it doesn’t offer the same precise localization as CT. Seidel’s test, while part of evaluating ocular integrity after trauma, does not image or manage the foreign body itself.