title: Neck mass of uncertain etiology.
mesh_terms: D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D006258:Head and Neck Neoplasms / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D006801:Humans; D008875:Middle Aged; D009362:Neoplasm Metastasis