Abstract
A 10-year old girl presented with fatigue, hypercalcemia, and subperiosteal phalangeal osteolytic lesions. Ultrasonography and MIBI scintigraphy showed a structure near the lower pole of thyroid gland.
The structure macroscopically appeared as adenoma, histologically it was thymic tissue. Bilateral neck exploration together with exploration of cervical thymic extensions was performed; adenoma was not found.
During next two years, the level of calcium and parathormone raised, bone mineral density decreased. Ultrasonography, MRI, CT and PET/CT were negative.
Adenoma was located by MIBI-SPECT/CT near the left border of jugulum. It was found dorsolateral to left common carotid artery and removed.