Havana syndrome: Overview for otolaryngologists.

Havana Syndrome is used to describe the array of deficits seen in diplomats stationed in Cuba from August 2016 to September 2017.1 Patients from this cohort were clinically studied, investigating their symptoms, audition and vestibular deficits, and imaging abnormalities seen on MRI.1-3 The primary studies were retrospective, looking at how these symptoms could be classified or fit into diagnostic criteria. The cohort had many similarities: a sound at the onset of symptoms, a mix of neurologic and otologic symptoms, and persistent symptoms that lasted for months.1-3 Theories of the cause of Havana Syndrome have led to no conclusive answer. Potential viral etiologies, mass psychogenic illness, and head trauma were examined as causes.1-5 Diseases with established diagnostic criteria were used to compare the patients' symptoms to try to find a disease that fits Havana Syndrome.3 Recent information from the Office of the Director of National Intelligence suggested the most likely cause to be mass psychogenic illness. With the cause of Havana Syndrome still unknown, a review of reported cases and reports helps otolaryngologists understand Havana Syndrome so they diagnose it only when appropriate and do not miss other conditions that may present with similar symptoms and that might respond well to targeted treatment.