Figure 1.

Percent of Medicare beneficiaries treated for ruptured cerebral aneurysms using coiling (2007-2012). Each blue dot represents the percent of Medicare beneficiaries who were treated for cerebral aneurysms with coiling in one of 306 hospital referral regions in the U.S. Red dots indicate the regions with the 5 lowest and 5 highest rates. The names of the latter can be found on the right. (Bekelis K, Goodney RP, Dzebisashvili N, Goodman DC, Bronner KK. Variation in the Care of Surgical Conditions: Cerebral Aneurysms. Lebanon, NH, 2014, reproduced with permission)