Imaging for Thoracic Back Pain with Midline Tenderness

Initial Imaging Selection Algorithm

For a patient with thoracic back pain and midline tenderness, the American College of Radiology recommends thoracic spine radiography (X-ray) as the initial imaging study rather than CT without contrast, especially in patients with risk factors like osteoporosis, advanced age, or chronic steroid use 1, 5
The presence of red flags such as myelopathy or radiculopathy symptoms, suspicion of cancer, infection, or immunosuppression, history of trauma, bone destruction, fracture, or spinal deformity on previous imaging, or history of instrumented spinal fixation should be assessed, as these may require different imaging approaches 3, 4, 5, 6, 1

For patients with acute thoracic back pain (<4 weeks) without red flags, imaging is typically not indicated, and conservative management should be first-line treatment, according to the American College of Radiology 7, 1
For patients with subacute (4-12 weeks) or chronic (>12 weeks) thoracic back pain without red flags, imaging is also typically not indicated, and conservative therapy should be first-line, as recommended by the American College of Radiology 8
For patients with midline tenderness, thoracic spine radiography (X-ray) is the initial imaging recommendation, as it can assess for alignment issues, fractures, and bone destruction, and is useful as an initial screening study, particularly in patients without neurologic deficits, according to the American College of Radiology 1, 5, 4

X-ray is appropriate as the initial study because it provides adequate screening for most structural abnormalities, involves less radiation exposure than CT, and is more cost-effective for initial evaluation, as stated by the American College of Radiology 1, 5
CT without contrast should be reserved for follow-up after abnormal X-ray findings, presurgical planning, cases where more detailed osseous evaluation is needed, or patients with instrumented spinal fixation history, according to the American College of Radiology 6, 9, 5

Midline tenderness may indicate vertebral fracture, especially in patients with risk factors like osteoporosis, advanced age, or chronic steroid use, and if X-ray is negative but clinical suspicion remains high, further imaging with MRI (preferred) or CT may be warranted, as recommended by the American College of Radiology 5
Thoracic disc abnormalities (herniations, bulges) are common in asymptomatic patients and may not correlate with pain, according to the American College of Radiology 7

For patients with myelopathy or radiculopathy, MRI without contrast is the preferred initial imaging, as recommended by the American College of Radiology 3
For patients with suspected cancer or infection, MRI with and without contrast is preferred, according to the American College of Radiology 4
For elderly patients or those with osteoporosis, X-ray is still appropriate initially, but have a lower threshold for advanced imaging, as stated by the American College of Radiology 5