A Feline Case of Jejunal Lymphoma Presenting with Tension Pneumoperitoneum.

An old neutered male cat was brought to the hospital with primary signs of anorexia, difficulty breathing, abdominal distension, and purulent rhinorrhea. Clinical examinations showed tension pneumoperitoneum and an intraperitoneal mass of 4 cm in diameter. A needle puncture was performed, releasing 830 mL of gas, at which point breathing improved. A laparotomy was then performed, and a jejunal mass leaking air was excised, followed by abdominal closure. The mass was diagnosed as lymphoma. It is assumed that the lymphoma gave rise to gastrointestinal perforation, which, together with chronic obstructive nasal disease, led to the tension pneumoperitoneum. The pneumoperitoneum did not recur after surgery, and the cat’s condition improved.