title: Ectopic thymic tissue presenting as a lateral cervical swelling.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D007223:Infant; D009333:Neck / Q000002:abnormalities*; D013902:Radiography, Thoracic; D013950:Thymus Gland / Q000002:abnormalities* / Q000033:anatomy & histology; D013953:Thymus Neoplasms / Q000175:diagnosis