Cat case report highlights duodenal source of biliary peritonitis
Bottom line
A new case report in Veterinary Radiology & Ultrasound describes a 10-year-old spayed female Korean shorthair cat with hematemesis and lethargy that was ultimately diagnosed with biliary peritonitis caused by two proximal duodenal perforations near the major duodenal papilla. The report centers on imaging and surgical confirmation: CT identified the lesion pattern, and exploratory laparotomy confirmed the perforations and the source of bile leakage. The case adds to a small but clinically important body of feline literature around duodenal and biliary emergencies, where disease at or near the papilla can quickly progress to life-threatening abdominal contamination. (pmc.ncbi.nlm.nih.gov)
Why it matters: For veterinary teams, the report is a reminder that bile peritonitis in cats doesn't always originate from the gallbladder or common bile duct itself. Proximal duodenal disease, especially near the major duodenal papilla, can mimic or precipitate extrahepatic biliary pathology, and cross-sectional imaging may help define anatomy before surgery. That matters because feline biliary surgery carries meaningful perioperative risk, while delayed recognition of perforation can worsen prognosis. The broader literature also suggests CT can be particularly useful when ultrasound raises concern but can't fully characterize peri-papillary or obstructive lesions. (pubmed.ncbi.nlm.nih.gov)
What to watch: Watch for whether this case prompts more discussion around when cats with acute vomiting, hematemesis, abdominal effusion, or suspected biliary leakage should move earlier from ultrasound to CT and surgical exploration. (acvr.org)
Key facts
- Study type
- Case report
- Journal
- Veterinary Radiology & Ultrasound
- Patient
- 10-year-old spayed female Korean shorthair cat
- Presenting signs
- Hematemesis and lethargy
- Diagnosis
- Biliary peritonitis secondary to proximal duodenal perforation
- Lesion location
- Two perforations in the proximal duodenum near the major duodenal papilla
- Imaging
- CT identified the suspected lesion pattern
- Surgery
- Exploratory laparotomy confirmed the perforations and bile leakage
A newly reported feline case in Veterinary Radiology & Ultrasound highlights an uncommon but high-stakes emergency: biliary peritonitis secondary to proximal duodenal perforation. In the case, a 10-year-old spayed female Korean shorthair cat presented with hematemesis and lethargy, and clinicians identified two perforations in the proximal duodenum near the major duodenal papilla. CT established the suspected diagnosis, which was then confirmed at exploratory laparotomy. (pmc.ncbi.nlm.nih.gov)
That location matters. The feline major duodenal papilla sits at a tightly packed junction of the duodenum, common bile duct, and pancreatic duct, so pathology in this region can create overlapping gastrointestinal, biliary, and pancreatic signs. Prior feline reports have described extrahepatic biliary obstruction from disease at or near the papilla, including foreign bodies, inflammation, neoplasia, and choledochal injury, but published reports of bile peritonitis specifically traced to proximal duodenal perforation appear to be rare. (pubmed.ncbi.nlm.nih.gov)
The broader literature helps frame why this case is notable. Older reviews of feline extrahepatic biliary tract surgery found bile peritonitis among affected cats and described substantial early mortality when biliary diversion procedures were required. More recent case reports have shown that advanced imaging, including contrast-enhanced CT, can clarify whether the primary problem is biliary obstruction, duct perforation, or peri-papillary duodenal disease before the abdomen is opened. In that sense, this report fits with a growing trend in referral medicine: using CT not just to confirm an abdominal emergency, but to map the surgical problem more precisely. (pubmed.ncbi.nlm.nih.gov)
There are also practical imaging lessons here. The American College of Veterinary Radiology describes ultrasound as a common first-line modality for abdominal disease, but it also notes that image acquisition and interpretation are highly operator-dependent. CT is less available and more costly, but it offers better anatomic resolution for complex regions and is increasingly used when ultrasound findings are incomplete or when surgical planning hinges on defining relationships among the duodenum, bile duct, and adjacent structures. That distinction is especially relevant in cats with suspected perforation or biliary leakage, where time-sensitive decisions may depend on understanding exactly where the rupture originated. (acvr.org)
Direct expert reaction to this specific paper was limited in publicly available sources, but the surrounding specialty guidance and case literature point in the same direction: peri-papillary disease in cats is easy to underestimate, and imaging choice can materially affect management. Recent feline case reports involving duodenal foreign bodies, common bile duct perforation, and reconstructive surgery around the pancreaticobiliary junction all emphasize the value of CT in defining lesions that sit in this anatomically crowded area. (pubmed.ncbi.nlm.nih.gov)
Why it matters: For general practitioners, emergency clinicians, surgeons, and radiologists, this case broadens the differential list when a cat presents with abdominal effusion, hematemesis, lethargy, jaundice, or suspected septic or bile peritonitis. It suggests the source may be proximal duodenal perforation rather than a primary gallbladder or duct lesion alone. That can influence referral timing, imaging escalation, surgical planning, and conversations with pet parents about prognosis and cost. It also reinforces a familiar but important point in feline medicine: uncommon anatomy-driven emergencies can look nonspecific at presentation, and delay can narrow treatment options. (pmc.ncbi.nlm.nih.gov)
What to watch: The next question is whether additional reports help define a more consistent diagnostic pathway for cats with suspected peri-papillary perforation or biliary leakage, including when CT should be recommended after ultrasound and which surgical approaches produce the best outcomes in these fragile patients. For now, this appears to be a signal case rather than a practice-changing series, but it adds useful evidence to a sparse literature base. (pubmed.ncbi.nlm.nih.gov)