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Intermittent percutaneous drainage of ovarian tumour. INTRODUCTION: Abdominal pain and distention are common in ovarian tumours. When the ovarian tumour grows too large, the tumour can cause these symptoms. Percutaneous drainage from ovarian tumours, which can alleviate symptoms, is traditionally discouraged for its potential risk of peritoneal tumour seeding. CASE: A 73-year-old woman with a multilocular ovarian tumour reporting abdominal fullness and pain was referred to the palliative care outpatient department. The multilocular tumour occupied most of the intra-abdominal space, which was determined to cause her symptoms. To alleviate her symptoms, we performed intermittent percutaneous drainage for 1.5 years. A clinical autopsy revealed the tumour was an ovarian mucinous carcinoma. Despite iterative tumour drainage, we observed no feature of peritoneal dissemination. CONCLUSION: Intermittent percutaneous drainage of ovarian tumours could reduce tumour-related abdominal symptoms without pathological evidence of peritoneal dissemination. This procedure can be a new palliative treatment option for ovarian tumour-related abdominal symptoms.