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pathologie@vetmed.fu-berlin.de
A 4-year old English thoroughbred mare intensely used as a performance racehorse had repeated mild exercise-induced pulmonary haemorrhage over two weeks before it developed acute neurological signs, including circular walking, convulsions, and self-trauma. Clinical examination revealed gurgling cardiac murmur, low oxygen saturation and diverse superficial skin wounds. Echocardiography displayed abundant air bubbles within the right atrium and ventricle. Increasing therapy-resistant neurological deficits lead to euthanasia. At necropsy, severely enlarged tracheobronchial lymph nodes were found. Surprisingly, no changes were identified that could have conceivably caused entry of air into the circulation.