This book employs a cased-based format similar to the earlier Krings book, Case-Based Interventional Neuroradiology. After describing a clinical scenario the relevant anatomic structure or variation will be described and explained (embryological background) and its impact on treatment decisions and treatment modalities are explained. Potential complications that may arise if not properly recognized are indentified. Images of other similar cases are added to show the spectrum of the anatomy and its variations. References to the pertinent literature are provided for each case. Cases are grouped to allow for smooth reading cover to cover and at the same time to quickly get one up to speed prior to performing a procedure where one encounters a similar variation. Imaging includes conventional angiography but will also include MR/​MRA and CT/​CTA when appropriate"--Provided by publisher.