title: [A sixteen year-old male with right calf pain and motor difficulty].
authors.affiliation: Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México, D. F., México.
authors.forename: Francisco
authors.initials: F
authors.lastname: Uc-Pool
authors.forename: Sergio
authors.initials: S
authors.lastname: Torres-Vargas
authors.forename: Isabel
authors.initials: I
authors.lastname: Alvarado-Cabrero
mesh_terms: D000293:Adolescent; D006801:Humans; D008297:Male; D051346:Mobility Limitation; D010146:Pain / Q000209:etiology; D012512:Sarcoma, Ewing / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000473:pathology*; D013848:Thigh