title: [Infrequent malignant tumors in children: clinical and epidemiologic aspects].
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003364:Costa Rica; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009369:Neoplasms / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology / Q000628:therapy; D012959:Socioeconomic Factors
vernacular_title: Tumores malignos poco frecuentes en el niño: aspectos clínicos y epidemiológicos.