A case report of a functioning mediastinal parathyroid cyst with no 99mTc-MIBIÂ uptake

Patients with parathyroid cysts sometimes have negative 99mTc-MIBI scans. We should consider a parathyroid cyst when a mediastinal cystic mass is demonstrated. Surgical resection is thought to be the optimal therapeutic choice for mediastinal parathyroid cysts irrespective of functioning because mediastinal parathyroid cysts are large and produce compressive symptoms.