A rare lumbosacral trunk variation: communicating branches to the femoral and obturator nerves.

This study reports a rare form of LST variation, in which both sides gave off one or two communicating branches to other nerves. This variation has significant clinical importance, as compression of the L5 nerve root may produce clinical presentations that do not match standard anatomical expectations. In addition to typical sciatica, atypical symptoms such as pain and sensory abnormalities in the groin area and anteromedial thigh may occur. Clinicians should be aware of such variations, especially when patient symptoms are inconsistent with imaging findings, and should consider possible neuroanatomical variations. This finding provides new anatomical evidence for understanding the complexity of nerve distribution in the lumbosacral region and for improving the diagnosis and treatment of related disorders.