[Diagnosis and treatment of Osler's disease].

Osler's disease is an autosomal dominant hereditary syndrome which belongs to the group of orphan diseases. Affected patients suffer primarily from severe epistaxis. Diagnosis is based on the Curaçao criteria and molecular genetic tests. Organ manifestations can be found in the form of arteriovenous shunts in the lung, liver, and gastrointestinal tract; more rarely also in the central nervous system (CNS) and other parts of the body. Many patients with gastrointestinal and other organ manifestations are frequently clinically asymptomatic; therefore, organ screening is essential to avoid later complications and should be performed in centers with particular expertise. No curative therapy currently exists. From the otolaryngologist's perspective, nasal mucosa treatments and endonasal laser applications are important and effective therapeutic approaches to epistaxis. Pharmacological interventions are focused on compensation of haploinsufficiency as well as antiangiogenetic approaches. Severe side effects have to be considered.