RT Journal Article SR Electronic T1 Bilateral Retropharyngeal Parathyroid Hyperplasia Detected with 4D Multidetector Row CT JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP E80 OP E82 DO 10.3174/ajnr.A2104 VO 32 IS 5 A1 R.D. Welling A1 J.A. Olson, Jr. A1 P.G. Kranz A1 J.D. Eastwood A1 J.K. Hoang YR 2011 UL http://www.ajnr.org/content/32/5/E80.abstract AB SUMMARY: We present a case of bilateral retropharyngeal parathyroid hyperplasia detected with 4D-CT in a patient with persistent primary hyperparathyroidism and failed neck exploration. We discuss the embryologic basis of ectopic retropharyngeal parathyroid adenomas and hyperplasia and the utility of 4D-CT in their localization for surgical planning. PTHparathyroid hormoneSPECTsingle-photon emission computed tomography