Fig. 2

Pathohistological diagnosis of ectopic parathyroid cyst inside the thymus. In histopathological macroscopic findings after thymectomy, bloody fluid was observed in cyst containing 19,960,000 pg/mL of intact-PTH (A). In histopathological microscopic findings with Hematoxylin-Eosin staining (B (× 20) and C (× 100)), the formation of cavity of cyst was surrounded by parathyroid cells (hyperplastic glands (B) or lining parathyroid cells (C)) which was inside the thymus and fatty tissue. Immunohistochemical staining of PTH (D (× 400)) was positive