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The Maine Coon in cluster 5 had a large abdominal mass (centre) measuring 8 × 13 cm removed during an exploratory laparotomy. The local draining mesenteric lymph node (left) was also removed during surgery, as was the ~12 ml ascitic fluid (right). The fluid was tested for mutated feline coronavirus by reverse transcription quantitative PCR but was negative. Retrospective histopathological examination of the mass (centre) showed scattered mycobacteria
