RT Journal Article SR Electronic T1 Cystic Parathyroid Adenomas on Dynamic CT JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP E107 OP E109 DO 10.3174/ajnr.A2186 VO 32 IS 6 A1 Sillery, J.C. A1 DeLone, D.R. A1 Welker, K.M. YR 2011 UL http://www.ajnr.org/content/32/6/E107.abstract AB SUMMARY: We have encountered 2 cases of parathyroid adenomas that are atypical because of their large size, cystic character, and faint enhancement compared with the typical solid parathyroid adenomas. Specifically, the enhancement pattern of a typical parathyroid adenoma in a multiphasic scan demonstrates rapid arterial enhancement and rapid washout on delayed imaging, whereas, comparatively, the 2 cystic parathyroid adenomas we encountered demonstrated less arterial phase enhancement and little washout on venous and delayed-phase imaging. ANTanteriorIiodineLAOleft anterior obliquePTHparathyroid hormoneRAOright anterior obliqueSPECTsingle-photon emission tomographyTctechnetium