Fig. 1.

Chemical formula (a), macroscopic appearance (b) and material for the injection of cyanoacrylates (c). The structural chemical formula of n-butyl cyanoacrylate (nBCA) is shown exemplarily. After the injection into saline, n-BCA (Histoacryl shown here for visualization purposes because of its blue color) spreads out in droplets. The copolymers immediately begin to polymerize, which is visualized by the whitish smaller droplets and by the whitish margins of the larger droplets. Cyanoacrylates are commonly delivered in small plastic bottles (Glubran 2 is shown here). After manual mixing with iodized oil in a small bowl, and after flushing the microcatheter with glucose solution, the cyanoacrylate-iodized oil mixture is ready for injection