Respiratory Failure Revealing a Multilocular Thymic Cyst in an Infant

Multilocular thymic cysts are rare benign acquired lesions of the neck and mediastinum. In children, multilocular thymic cysts are usually symptomatic after the age of 2 years and produce few symptoms. We report an unusual case of a multilocular thymic cyst diagnosed in a 3-month-old girl, causing severe respiratory failure. We believe that this unusual presentation has not been previously reported in the literature.