A man aged 83 years under treatment with enzalutamide for castration-resistant prostate cancer presented with general malaise and exertional dyspnea. The underlying cause could not be identified by further investigations. On the 5th hospital day, he died due to a sudden exacerbation of dyspnea. The results of an autopsy indicated tumor emboli and stenosis of small pulmonary arteries with the fibrocellular intimal thickening, and therefore our final diagnosis was pulmonary tumor thrombotic microangiopathy.
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