1. 1. Halenka M, Frysak Z, Koranda P, Kucerova L. Cystic parathyroid adenoma within a multinodular goiter: a rare cause of primary hyperparathyroidism. J Clin Ultrasound 36: 243-246, 2008.
2. 2. Wani S, Hao Z. Atypical cystic adenoma of the parathyroid gland: case report and review of literature. Endocr Pract 11: 389-393, 2005.
3. 3. McCoy KL, Yim JH, Zuckerbraun BS, Ogilvie JB, Peel RL, Carty SE. Cystic parathyroid lesions: functional and nonfunctional parathyroid cysts. Arch Surg 144: 52-56, 2009.
4. 4. Johnson NA, Yip L, Tublin ME. Cystic parathyroid adenoma: sonographic features and correlation with 99mTc-sestamibi SPECT findings. AJR Am J Roentgenol 195: 1385-1390, 2010.
5. 5. Suzuki K, Sakuta A, Aoki C, Aso Y. Hyperparathyroidism caused by a functional parathyroid cyst. BMJ Case Rep 2013: 2013.