A total of 478 malformations were found in 417 patients, which constituted 27.6 % of the entire group. Malformations occurred in 250 women (25.4 % of all women) and 167 men (31.6 % of all men) and the female to male ratio in affected individuals was 1.5:1. The predominance of the occurrence of malformations observed in men was statistically significant (p = 0.009). The most frequently occurring malformations were the presence of six sacral vertebrae (179 patients) and megatransversus at L5 (150 patients). The study confirmed a high incidence of congenital malformations in the area of the lumbosacral transitional vertebrae and demonstrated a higher incidence in males. Unilaterally occurring megatransversus at L5 was significantly more common on the left side.
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