We describe a rare case of hemoperitoneum secondary to spontaneous rupture of hepatic metastasis from lung cancer. A 72-year-old man with non-small cell lung cancer was admitted to our hospital with sudden onset of right upper abdominal pain and hypovolemic shock. Laboratory tests showed severe anemia. Abdominal contrast-enhanced computed tomography revealed massive ascites and multiple liver metastases. Rupture of a metastatic liver tumor was suspected. Only palliative therapy was performed. The patient's general condition gradually worsened, and he died 2 months after admission. Autopsy examination revealed hemoperitoneum due to a ruptured metastatic liver tumor originating from pulmonary squamous cell carcinoma.
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