Aberrant Cervical Thymus Mimicking Thyroid on Ultrasonography: A Case Report

An abnormally positioned thymus may either be aberrant or ectopic. Aberrant cervical thymus (ACT) is located along the normal pathway of descent of the thymus, with an attachment to mediastinal thymus via thymic tissue or fibrous cord in 50% of the cases (1). ACT is usually diagnosed within the first and second decade of life, and most lesions are cystic (1-3). We experienced a case of the solid ACT in a 27-year-old female, which was seen as a soft-tissue lesion between the left thyroid and common carotid artery (CCA). We present the imaging features of this case and review the relative literatures.