Site and morphology of PCA P1/2 aneurysm suggests likely dissecting aneurysm and thrombosis. Enhancing wall raises concern over infective - but no underlying infection identified and the progress was not in keeping with mycotic aneurysm. So called inflammatory aneurysms, with enhancing wall, in our experience are more likely to be associated with headache, and to have a higher chance of recanalization despite combined coil and stent treatment hence early follow up. In the presence of edema, thrombus, coils, stent and neck remnant - MRI can be hard to make a firm diagnosis of the degree of recanalization vs new thrombus. IV DSA on the newer platforms - in this case a 2016 Siemens unit - can give more definitive imaging.