[Juvenile ankylosing spondylitis. Presentation of 2 cases].
D000293:Adolescent; D002648:Child; D006801:Humans; D008297:Male; D011859:Radiography; D013167:Spondylitis, Ankylosing / Q000000981:diagnostic imaging*
Espondilitis anquilosante infantil. Presentación de 2 casos.