Why is fever and back pain concerning in a patient on chemotherapy or with HIV?

Why is fever and back pain concerning in a patient on chemotherapy or with HIV?

• A. Vertebral osteomyelitis or spinal epidural abscess requiring urgent evaluation.
• B. Likely benign muscle strain.
• C. Osteoarthritis.
• D. Disc herniation.

Answer: (A)

Fever with back pain in someone who is immunocompromised (on chemotherapy or with HIV) is a red flag for a spinal infection until proven otherwise. The most worrisome scenario is vertebral osteomyelitis or a spinal epidural abscess. These infections can spread rapidly and compress the spinal cord or nerve roots, leading to permanent neurologic damage or sepsis if not treated quickly.

Because the immune system may not respond typically, this combination of symptoms demands urgent evaluation. The priority is imaging with MRI of the spine (contrast-enhanced) to visualize the vertebrae, intervertebral discs, and any epidural or paraspinal collections. Blood cultures should be obtained, and empiric antibiotics may be started after cultures if suspicion is high, with adjustments once organisms are identified. Early involvement of neurosurgery or orthopedics is often needed if there is abscess or neurological signs.

Other common back pain causes like benign muscle strain, osteoarthritis, or disc herniation usually lack fever or systemic signs in this context and don’t carry the same immediate risk of spinal cord injury, so fever makes those explanations less likely.