Fig. 17

Ectopic thyroid on the left parotid gland with a palpable left parotid mass in a 69-year-old male patient. a, b Axial and coronal enhanced neck CT scan demonstrates well-defined homogeneous enhancing mass (white arrows) within the left parotid gland with preserved surrounding fat planes. It also shows a normal thyroid in normal position in the lower neck. c Image taken 20 minutes after 5 mCi injected Tc99m-Pertechnetate shows normal thyroid uptake of tracer and physiological uptake in the salivary glands (short black arrow). There is a distinct focus of abnormal tracer accumulation in the left parotid/submandibular region. Patient was given lemon juice with evident normal washout from the salivary glands and relative retention by this abnormal focus (long black arrow)