Pancreatic fluid collections result from many causes, including damage to the pancreas or premalignant or malignant conditions. Fluid collections can be large and cause symptoms such as pain and fevers, although most are smaller and asymptomatic. There are many types of pancreatic fluid collections. The most common is called a pancreatic pseudocyst. These collections are called “pseudocysts” because they lack what is called an epithelial layer, which is typically present in “true” cysts. However, pseudocysts always develop as a result of injury to the pancreas and are defined by the fact that that are fluid filled. Most pseudocysts are asymptomatic and will resolve on their own. However, occasionally, these need to be drained if pain, fever or infection develop. Another type of fluid collection that results from pancreatic injury is called Walled Off Pancreatic Necrosis or “WOPN.” In the past, WOPN has been called other terms such as pancreatic abscess.