title: Malignant fibrous histiocytoma arising in a smallpox vaccination scar.
mesh_terms: D002921:Cicatrix / Q000150:complications*; D018219:Histiocytoma, Benign Fibrous / Q000209:etiology* / Q000648:ultrastructure; D006801:Humans; D008297:Male; D008875:Middle Aged; D012878:Skin Neoplasms / Q000209:etiology* / Q000648:ultrastructure; D012899:Smallpox / Q000517:prevention & control*; D014611:Vaccination / Q000009:adverse effects*