title: Clinical images: Physiologic sacral mass as observed using magnetic resonance imaging.
authors.affiliation: Catholic University of Korea College of Medicine, Seoul, Korea.
authors.forename: Kyung-Su
authors.initials: KS
authors.lastname: Park
authors.forename: Chul-Soo
authors.initials: CS
authors.lastname: Cho
authors.forename: Ho-Youn
authors.initials: HY
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D005260:Female; D015796:HLA-B27 Antigen / Q000378:metabolism; D006801:Humans; D008279:Magnetic Resonance Imaging; D012446:Sacroiliac Joint / Q000473:pathology*; D012447:Sacrum / Q000473:pathology; D013167:Spondylitis, Ankylosing / Q000175:diagnosis* / Q000276:immunology / Q000473:pathology*
chemical_list: D015796:HLA-B27 Antigen