患者，男，60岁。阑尾切除术后第6天起上腹隐 痛，伴发热、寒战，体温高达39. 5^，无腹泻。右下 胸叩痛，呼吸音减弱;腹稍胀，右上腹压痛，腹肌 软，未及肿块，肠鸣音不亢进。最可能的诊断是（ ）。

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