If imaging rules out disc pathology in a patient with thoracic pain, which organ could be considered as a potential source of discomfort?

If imaging rules out disc pathology in a patient with thoracic pain, which organ could be considered as a potential source of discomfort?

• A. Dura mater
• B. Diaphragm
• C. Kidney
• D. Urinary bladder

Answer: (C)

Organ systems can refer pain to the chest even when the spine isn’t the source. The kidneys, located retroperitoneally, send afferent pain signals into spinal segments around T10–L1. That means irritation or pathology of the kidney can be felt as pain in the thoracic region or mid-back, not just in the flank or groin. So if imaging rules out disc pathology, the thoracic pain could be coming from the kidney, making it the most plausible non-spinal source among the options. The other structures fit less well: irritation of the diaphragm tends to cause shoulder or neck pain via the phrenic nerve (C3–C5) more than isolated thoracic chest wall pain; the urinary bladder usually presents with lower abdominal or pelvic discomfort; and the dura mater would imply a spinal issue rather than a distinct visceral source when discs are ruled out.

Organ systems can refer pain to the chest even when the spine isn’t the source. The kidneys, located retroperitoneally, send afferent pain signals into spinal segments around T10–L1. That means irritation or pathology of the kidney can be felt as pain in the thoracic region or mid-back, not just in the flank or groin. So if imaging rules out disc pathology, the thoracic pain could be coming from the kidney, making it the most plausible non-spinal source among the options.

The other structures fit less well: irritation of the diaphragm tends to cause shoulder or neck pain via the phrenic nerve (C3–C5) more than isolated thoracic chest wall pain; the urinary bladder usually presents with lower abdominal or pelvic discomfort; and the dura mater would imply a spinal issue rather than a distinct visceral source when discs are ruled out.