Currently about 50% of cases of haemoptysis are thought to be cryptogenic. Haemorrhage from the pulmonary arterial system is rare and usually due to aneurysms or pseudoaneurysms, the radiological diagnosis of which is often difficult. We report here the case of a patient admitted with a heavy haemoptysis in whom the thoracic CT scan did not reveal the diagnosis. Bronchoscopy with endobronchial ultrasound showed a vascular malformation of a branch of the pulmonary artery allowing a radiological embolisation. This case underlines the importance of bronchoscopy and the role of ultrasound in the diagnosis of haemoptysis, considered ideopathic, complicating vascular malformations.
Keywords: Artère pulmonaire; Cryptogenic Haemoptysis; EBUS; Endobronchial ultrasound; Hémoptysie cryptogénique; Malformation vasculaire; Pulmonary artery; Vascular malformation; Échoendoscopie radiaire; Échographie endobronchique.
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