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Congenital tracheobronchomegaly (Mounier-Kuhn Syndrome, MKS) is a rare idiopathic disorder characterized by dilation of the central airways, including the trachea and first through fourth order bronchi. MKS disproportionately affects men and results in chronic respiratory tract infections. The diagnosis is made through the synthesis of clinical and radiological data. Here we report a unique case of MKS in a patient with human immunodeficiency virus (HIV) infection. A 45-year-old African American woman with a past medical history of HIV, tobacco and recreational drug abuse, chronic obstructive pulmonary disease, sleep apnea, and a 15-year history of recurrent respiratory infections presented with dyspnea, wheezing, a productive cough, increased yellow-green sputum production, and subjective fevers. Computerized tomography (CT) of the chest revealed striking dilation of the trachea and central bronchi. Fiberoptic bronchoscopy demonstrated a dilated trachea and bronchial tree with complete collapse of the trachea and bilateral mainstem bronchi during expiration. Serial imaging over 14 years allowed the radiologist to confidently diagnose her underlying disorder and recommend appropriate clinical management, which included mucolytics, chest physiotherapy, prophylactic vaccinations, and antibiotics during infectious exacerbations. To the best of our knowledge, there is only one reported case of MKS in the setting of HIV in the English literature. We report the second such case and outline the clinical presentation, diagnostic criteria, and management of MKS with the hope that increased awareness will prevent delayed or misdiagnosis for patients with MKS. This case highlights the common diagnostic delay for MKS and the need to include MKS in the differential diagnosis of recurrent respiratory tract infections.

Congenital Tracheobronchomegaly (Mounier-Kuhn Syndrome) in a Woman with Human Immunodeficiency Virus: A Case Report