Unilateral lumbarisation of the first sacral segment (S1), classified as Castellvi type 2A. This case is very interesting because it is combined with the assimilation of the first coccygeal segment. So, while there seems to be 6 lumbal vertebrae, sacrum seems “normal” with 4 pairs of foraminae sacralis. Foraminal stenosis could cause nerve impingement, via osteophytes formation. (medieval skeleton from Serbia).
 

Unilateral lumbarisation of the first sacral segment (S1), classified as Castellvi type 2A. This case is very interesting because it is combined with the assimilation of the first coccygeal segment. So, while there seems to be 6 lumbal vertebrae, sacrum seems “normal” with 4 pairs of foraminae sacralis. Foraminal stenosis could cause nerve impingement, via osteophytes formation. (medieval skeleton from Serbia).

 

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    So cool! I know someone with an L5 sacralization, but I’ve never seen an S1 lumbarization before.
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