Pancreatic injuries include a variety of injuries from simple contusion to complete rupture of the duct and pancreatic head. Although pancreatic lesions are rare in children, the pancreatic pseudocyst is the most common posttraumatic cystic lesion of the pancreas and is a localized collection containing pancreatic juice and the peripancreatic necrotic test. The management of the pancreatic pseudocyst has evolved from the stage of exclusive surgical treatment exclusively, to the conservative one, respectively the stage of minimally invasive treatment (percutaneous drainage, endoscopic drainage) and laparoscopic treatment. However, the management remains controversial, the approach depending on the type of lesion, size and evolutionary characteristics. This paper presents the case of a pediatric patient, polytrauma due to a rail accident who is diagnosed 3 weeks after hospitalization with a pseudocyst of the pancreas. We will present both he diagnostic means and the management, both medicinal and surgical, as well as the subsequent evolution of the patient.