A bilateral triangular-shaped hyperostosis of the lower, medial portion of the ilium immediately adjacent to the lower portion of the sacroiliac joint describes __________.

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This description is characteristic of osteitis condensans ilii, which is a benign condition that appears as triangular-shaped sclerotic areas on the ilium near the sacroiliac joint. Ankylosing spondylitis is a chronic inflammatory condition that affects the spine, and iliac horns and iliac vascular channels are uncommon anatomical variations that may be seen on imaging but are not related to hyperostosis or disease.

A Bilateral Triangular-Shaped Hyperostosis of the Lower, Medial Portion of the Ilium