PTH and cyst: As the cyst wall was tightly adherent to the surrounding organs and the preoperative serum intact parathyroid hormone level was normal, ruling out a functional parathyroid cyst, complete resection of the cyst wall was deemed unnecessary regardless of its origin.14,15) The cyst wall was resected as extensively as possible, and the luminal mucosa of the residual cyst was cauterized (Fig. 7D).