Urinothorax is defined as the presence of urine in the pleural cavity. Leakage from the urinary tract can cause urinoma with retroperitoneal urine collection, and secondarily, urinothorax. We report the case of a 35-year-old female who presented with dyspnoea and right-sided chest pain. Chest radiograph revealed a right-sided pleural effusion. The patient had undergone left-sided ovarian cystectomy three months ago, had sustained a left-sided ureteric injury that required ureteric stent placement. Urinothorax was suspected as a consequence of ureteric injury; pleural fluid to serum creatinine ratio was found to be greater than one, confirming the diagnosis.
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