ABSTRACT
The sciatic nerve passes through the greater sciatic foramen in proximity to the piriformis muscle (Figure 42.1). Compression in this fibro-osseus tunnel may result in the clinical picture of the piriformis syndrome. In 1928, Yeoman
described the importance of the neuromuscular relationship in the development of lumbosacral neuralgias. Since the L4-L5 and S1-S2 distributions are affected, the list of differential diagnoses can be quite long.
