<unk>  is a commonly missed cause of back pain which occurs due to lumbosacral transitional vertebrae (LSTV). It is a congenital condition but is not usually symptomatic until one's later twenties or early thirties. However, there are a few cases of<unk> 's that become symptomatic at a much earlier age. It is named for Mario<unk> , an Italian physician who first described it in 1917.
Bertolotti's syndrome
Renpenning's syndrome
Liddle's syndrome
Banti's syndrome
Grisel's syndrome
Wilkinson's syndrome
Bálint's syndrome
Susac's syndrome