A Coccyx MRI is a diagnostic imaging procedure that uses magnetic resonance imaging (MRI) to create detailed pictures of the coccyx (tailbone) and surrounding tissues. This non-invasive scan helps assess soft tissues, bones, nerves, and any abnormalities in the coccygeal region.

Why is it Performed?

A coccyx MRI is typically performed to:

1. Diagnose Pain or Injuries:
   • Identify the cause of tailbone pain (coccydynia), especially if other imaging techniques (e.g., X-rays) fail.
   • Assess fractures, dislocations, or degenerative changes in the coccyx.
2. Detect Tumors or Infections:
   • Identify soft-tissue tumours, osteomyelitis (bone infections), or other abnormalities such as chordoma or cysts.
3. Evaluate Post-Traumatic Issues:
   • Assess damage after falls or other traumatic injuries to the tailbone.
4. Prepare for Surgery:
   • Provide detailed imaging for surgical planning, such as in tumour resections or coccygectomy (tailbone removal)​

What are the benefits?

Detailed Imaging:

• Provides highly detailed views of both bone and soft tissue structures.
• Allows early and accurate detection of abnormalities.

Non-Invasive:

• No exposure to ionizing radiation, making it safer than CT scans.

Comprehensive Diagnosis:

• Can identify issues not visible on other imaging tests, such as inflammation or soft-tissue abnormalities

What are the limitations?

Claustrophobia:

• The enclosed nature of an MRI machine can cause anxiety in some patients.

Exclusion of Metal Implants:

• Patients with certain implants (e.g., pacemakers, metal rods) may not be eligible.

Limited Weight Capacity:

• Many MRI machines have weight limits, often around 120-140 kg.

Motion Sensitivity:

• Any movement during the scan can distort images, requiring retakes.

Contrast Agent Risks:

• For contrast-enhanced scans, patients with kidney or liver impairments may face additional risks.

Specific View Requirement:

• The coccyx is a small structure, so specific protocols (e.g., sagittal views) are essential for proper imaging, often requiring specialized orders

Source:

https://www.merckmanuals.com/professional/musculoskeletal-and-connective-tissue-disorders/coccyx-disorders/coccyx-disorders

https://medic-journal.com/musculoskeletal-mri/coccyx-mri/