What is the term for a lumbosacral transitional segment that presents with scoliosis and sciatica?

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Bertolotti's syndrome is a condition where a lumbosacral transitional segment (LSTS) presents with an enlarged transverse process that articulates with the sacrum or ilium, making it an extra joint. This can cause scoliosis and nerve compression leading to sciatica. Scheuermann's disease is a condition where the bones in the spine become wedged and cause a "hunchback" appearance. VACTERL syndrome is a birth defect that affects multiple systems in the body. Kartagener's syndrome is a rare genetic disorder that affects the respiratory and reproductive systems.

What Is the Term for a Lumbosacral Transitional Segment That