Multiple endocrine neoplasia type 1 patients usually develop tumors in their parathyroid glands and present with hyperparathyroidism before any other symptoms manifest. These tumors cause all four ...

the tumor extended beyond the thyroid capsule, with extrathyroid extension to the perithyroid soft tissues in 11 patients, and an infiltration of extrathyroidal localized parathyroid glands in 2 ...