title: [Difficulties in establishing the final diagnosis of mediastinal tumor in a 9-year-old boy].
mesh_terms: D002648:Child; D003937:Diagnosis, Differential; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000175:diagnosis*; D008228:Lymphoma, Non-Hodgkin / Q000175:diagnosis; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis*
vernacular_title: Trudności w ustaleniu ostatecznego rozpoznania guza śródpiersia u 9-letniego chłopca.