Ectopic thymic tissue of th neck.
D002675:Child, Preschool; D003560:Cysts / Q000175:diagnosis; D003937:Diagnosis, Differential; D006801:Humans; D007223:Infant; D008297:Male; D009333:Neck; D013950:Thymus Gland / Q000002:abnormalities* / Q000473:pathology; D013953:Thymus Neoplasms / Q000175:diagnosis