Fig. 3From: Anatomical variation of the sacroiliac joints: an MRI study with synthetic CT imagesNew sacroiliac joint (SIJ) variant with extra joint facet superiorly. Semi-coronal (a) and semi-axial (b) synthetic CT images depict a newly found SIJ variant in a 27-year-old women, consisting of an accessory joint cranial of the cartilaginous part of the SIJ, between bony projections from the ilium (arrows) and the posterosuperior edge of S1 vertebraBack to article page