title: Ossification of the posterior longitudinal ligament associated with etretinate therapy.
mesh_terms: D000328:Adult; D000368:Aged; D005050:Etretinate / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008022:Ligaments; D008297:Male; D009999:Ossification, Heterotopic / Q000139:chemically induced*
chemical_list: D005050:Etretinate