Iliolumbar ligament ossification: what research with this finding?

The patient did not present hyperparathyroidism, ankylosing spondylitis or Idiopathic skeletal hyperostosis, having a degenerative disease or a variation of normality as a probable etiology of the iliolumbar ligament ossification (Figure 1) (Figure 2). Figure 1 Anteroposterior X-Ray of the pelvis that demonstrates the ossification of the left iliolumbar ligament from the left transverse process of the fifth lumbar vertebra to the iliac crest (black arrow).