Case Report: Mimicking benignity: hepatic sinusoidal metastasis masquerading as diffuse liver disease in small cell lung cancer

Diffuse intra-sinusoidal liver metastasis originating from small cell lung cancer may serve as a clinically occult cause of liver failure. Such metastases progress rapidly, often leading to death within days to weeks. For patients with a history of malignant tumors, if imaging studies reveal diffuse liver lesions and rapidly progressing liver function abnormalities, there should be a high suspicion of diffuse hepatic sinusoidal metastasis. A timely liver biopsy should be performed to confirm the diagnosis, providing a theoretical basis for clinical diagnosis and treatment.