title: Pseudotumor of calcaneus in Christmas disease.
mesh_terms: D001803:Blood Transfusion; D001847:Bone Diseases / Q000209:etiology*; D002111:Calcaneus; D002648:Child; D005164:Factor IX / Q000627:therapeutic use; D006406:Hematoma / Q000209:etiology* / Q000628:therapy; D002836:Hemophilia B / Q000150:complications*; D006801:Humans; D008297:Male
chemical_list: D005164:Factor IX