Recurrent pulmonary embolus despite adequate anticoagulation: the case for routine cancer screening, prompted by an uncommon cause.

A middle-aged patient presented with dyspnoea, haemoptysis and weight loss following a recent admission for pulmonary embolus, diagnosed on CT pulmonary angiogram (CTPA). The patient was anticoagulated with warfarin to a therapeutic range 2-3. There was no relevant medical history.