Patients may evolve pseudocysts of the pancreas secondary to a severe pancreatitis. In case of a symptomatic or infected pseudocyst, a therapeutic drainage of the cyst is indicated. In modern medicine the preferred way to perform such a drainage is by the means of endoscopic ultrasound (EUS). It is not precisely elucidated how this EUS-procedure should be performed in different scenarios. The cyst appearance and the drainage stents and/or technique may impact the clinical outcome. This study is a prospective, single-center observational study on the outcome after EUS-guided drainage of pancreatic pseudocysts.