Imaging is indicated during the initial presentation if:

the diagnosis of acute pancreatitis is uncertain
there is abdominal distension and tenderness, fever >102 F (38,9 C), or leukocytosis
there is a Ranson score > 3 or APACHE score > 8
there is no improvement after 72 hours of conservative medical therapy
there has been an acute change in status: fever, pain, or shockCT is recommended as a delayed assessment tool in the following situations:

acute change in status
to determine therapeutic response after surgery or interventional radiologic procedure
before discharge in patients with severe acute pancreatitisAbdominal CT should not be performed before the first 12 hours of onset of symptoms as early CT (<12 hours) may result in equivocal or normal findings. CT findings can be classified into the following categories for easy recall:

Intrapancreatic – diffuse or segmental enlargement, edema, gas bubbles, pancreatic pseudocysts and phlegmons/abscesses (which present 4 to 6 wks after initial onset)
Peripancreatic / extrapancreatic – irregular pancreatic outline, obliterated peripancreatic fat, retroperitoneal edema, fluid in the lessar sac, fluid in the left anterior pararenal space
Locoregional – Gerotas fascia sign (thickening of inflamed Gerotas fascia, which becomes visible), pancreatic ascites, pleural effusion (seen on basal cuts of the pleural cavity), adynamic ileus, etc.The principal value of CT imaging to the treating clinician is the capacity to identify devitalised areas of the pancreas which have become necrotic due to ischaemia. Pancreatic necrosis can be reliably identified by intravenous contrast-enhanced CT imaging, and is of value if infection occurs and surgical or percutaneous debridement is indicated.
Brazilian hemorrhagic fever (BzHF) is an infectious disease caused by Brazilian mammarenavirus, an arenavirus. Brazilian mammarenavirus is one of the arenaviruses from South America to cause hemorrhagic fever. It shares a common progenitor with Argentinian mammarenavirus, Machupo mammarenavirus, Tacaribe mammarenavirus, and Guanarito mammarenavirus. It is an enveloped RNA virus and is highly infectious and lethal. Very little is known about this disease, but it is thought to be transmitted by the excreta of rodents. This virus has also been implicated as a means for bioterrorism, as it can be spread through aerosols.As of 2019, there had only been four documented infections of Brazilian mammarenavirus: two occurred naturally, and the other two cases occurred in the clinical setting. The first naturally occurring case was in 1990, when a female agricultural engineer who was staying in the neighborhood of Jardim Sabiá in the municipality of Cotia, a suburb of São Paulo, Brazil contracted the disease (The virus is also known as "Sabiá Virus"). She presented with hemorrhagic fever and died. Her autopsy showed liver necrosis. A virologist who was studying the womans disease contracted the virus but survived. Ribavirin was not given in these first two cases. Four years later, in 1994, a researcher was exposed to the virus in a level 3 biohazard facility at Yale University when a centrifuge bottle cracked, leaked, and released aerosolized virus particles. He was successfully treated with ribavirin.A fifth case, also naturally acquired in upstate São Paulo, was reported in January 2020.