**2. Clasification acute necrotizing pancreatitis**

Before to describe the management of infected necrosis, we need to know the classification of acute pancreatitis [11, 12].

The severity of acute pancreatitis can be defined as mild, moderately severe, or severe according to the revised Atlanta classification (**Table 1**).



**Table 1.**

*Clinical classification of pancreatitis (OF: Organ failure).*


There is another classification of AP severity that adds another step to the severity of these processes: Acute critical pancreatitis, in which persistent organ failure (OF) coexists with necrosis infection, described in 2012 by Petrov et al.

Classification according to radiological characteristics according to the Atlanta Classification:


Local complications of acute pancreatitis:

• Acute peripancreatic liquid collection: presence of peripancreatic liquid in the context of edematous interstitial pancreatitis. It occurs in the first 4 weeks


## **Table 2.**

*Warning pancreatic sign (BMI: Body mass index, BUN: Blood urea nitrogen).*

**Figure 1.** *In the CT scan image we can see acute pancreatic collection without radiological signs of infection.*

and is characterized by the appearance of homogeneous fluid adjacent to the pancreas and its fascial planes without the presence of a wall.

