They have diffuse or localised enlargement of the pancreas owing to inflammatory oedema. Clinically, the majority of patients with acute pancreatitis are present as interstitial oedematous pancreatitis. In general, acute pancreatitis is classically divided into two types: Interstitial oedematous pancreatitis and necrotising pancreatitis. Therefore, the purpose of this pictorial article is: To serve as an image-rich overview of different morphologic characteristics of the early-stage (within 4 wk after symptom onset) local complications associated with acute pancreatitis by CT or MR to clarify confusing imaging concepts and enable standardised reporting nomenclature to assist communication among treating physicians and to facilitate the implications for treatments.ĭEFINITION AND DIAGNOSIS OF EARLY-STAGE COLLECTIONS ASSOCIATED WITH ACUTE PANCREATITIS Although this classification updates the definitions of acute pancreatitis and many pancreatitis-associated complications, some inappropriate terms of the radiological diagnosis reports in the daily clinical work or available literature may still be found. With the increasing application of the revised Atlanta classification criteria 2012, radiologists play a crucial role in relevant imaging diagnosis, scientific research and multidisci-plinary team communication. Imaging approaches, especially computed tomography (CT) and magnetic resonance imaging (MRI), are valuable in detecting local complications associated with acute pancreatitis in both the early-phase and the late-phase of disease.

These developments thus prompt imaging to detect clinical complications. However, the natural history and consequences of critically ill patients (particularly moderately severe or severe acute pancreatitis) can result in a variety of local complications. Indeed, the routine medical imaging for this disease is unwarranted. Clinically, physicians often make the accurate diagnosis based on clinical manifestations and biochemical parameters (sufficiently elevated serum lipase or amylase) for the majority of patients with acute pancreatitis.

Cholelithiasis, alcoholism and hyperlipidaemia are the most widely recognised etiological factors in acute pancreatitis patients. Acute pancreatitis is a common digestive disease, which is related to an acute onset of epigastric pain with/without nausea and vomiting.

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