title: Late-onset variant fibrodysplasia ossificans progressiva leading to misdiagnosis of ankylosing spondylitis.
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Barnett
authors.forename: Manish
authors.initials: M
authors.lastname: Dugar
authors.forename: Eric A
authors.initials: EA
authors.lastname: Haan
mesh_terms: D030201:Activin Receptors, Type I / Q000235:genetics*; D000328:Adult; D000367:Age Factors; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D009221:Myositis Ossificans / Q000175:diagnosis* / Q000235:genetics* / Q000473:pathology*; D017354:Point Mutation / Q000235:genetics; D011859:Radiography; D013131:Spine / Q000000981:diagnostic imaging; D013167:Spondylitis, Ankylosing / Q000175:diagnosis
chemical_list: C425423:ACVR1 protein, human; D030201:Activin Receptors, Type I