| Summary: | Pulmonary sarcomatoid carcinoma (PSC) is a rare and highly invasive malignant tumour. It has similar clinical manifestations and imaging features to ordinary lung cancer. This current case report describes a 65-year-old male patient who had a mass in the apicoposterior segment of the left upper lobe with haemoptysis. Imaging studies revealed a central parenchymal mass surrounded by areas of ground-glass opacity, strongly indicating the presence of a pulmonary malignancy. Intraoperatively, the tumour was discovered to have invaded the chest wall and exhibited a significant propensity for bleeding. Consequently, a left upper lobe resection accompanied by extensive pleural debridement were performed. Subsequent postoperative histopathological examination confirmed the diagnosis of PSC. Unfortunately, 1 month after the surgery, the patient presented with left-sided haemothorax. Despite employing various haemostatic interventions, the patient eventually succumbed to haemorrhagic shock. This study provides a treatment strategy reference for patients with PSC presenting as haemothorax.
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