Superior cluneal nerve entrapment neuropathy due to lower crossed syndrome: A case with low back pain.

The superior cluneal nerve (SCN) is a sensory nerve known to be originated from the dorsal rami of the lower thoracic and lumbar nerve roots. One of the overlooked causes of low back pain (LBP) is the SCN Entrapment Neuropathy (SCNEN). SCNEN may also be associated with SCN stretching due to lumbar movement and the poor body posture through an increase in the paravertebral muscle tonus. A 59-year-old female patient presented with chronic LBP localized on the right iliac crest and radiating to the right buttock, groin, and leg. She had increased lumbar lordosis and anterior pelvic tilt. She had a tender point over the right iliac crest, and the pain was radiating to the buttock and posterolateral thigh (Tinel sign +). She was diagnosed with lower crossed syndrome and SCNEN, and a therapeutic nerve block was performed. Clinicians should consider SCNEN as a possible diagnosis of LBP.