The case of a 12-year-old boy with ectopic cervical thymus is reported. Thi
s is a rare differential diagnosis in cervical tumors in childhood. The cli
nical symptoms might present as complications; in rare cases malignant tran
sformations have been reported. The diagnosis ectopic cervical thymus can b
e achieved only histologically. Due to possible malignant transformation, i
t is mandatory to excise this thymus tumor totally.