Which of the following is NOT considered a contraindication for an MRI?

In the context of magnetic resonance imaging (MRI), certain conditions and devices can pose risks or complications, making them contraindications for the procedure. Pacemakers and cochlear implants are both examples of medical devices that can be affected by the strong magnetic fields generated during an MRI scan. These devices may malfunction or even pose a safety risk during the procedure, so precautions or alternatives need to be considered.

Severe claustrophobia can also be a contraindication because the MRI machine requires the patient to remain in a confined space for an extended period, which can trigger anxiety or panic in individuals who are severely claustrophobic. This can complicate the MRI process, leading to incomplete scans or the need for sedation.

In contrast, a shellfish allergy is not a contraindication for undergoing an MRI. While some contrast agents used in imaging can cause allergic reactions, the MRI itself does not involve the use of iodinated contrast materials (commonly associated with shellfish allergies). Instead, MRI primarily relies on the use of magnetic fields and radio waves to create images of the body. Therefore, having a shellfish allergy does not inherently pose a risk for patients undergoing an MRI, making it the correct response to the question regarding contraindications.