CTICasesBronchial Mucoepidermoid Tumor
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Imaging findings
Initial chest radiograph shows extremely subtle differences in aeration and vascular caliber, with the left lung appearing hyperlucent with narrower vessels. Ventilation-perfusion scan reveals matched ventilation and perfusion defects in the left lung. Expiratory radiographs confirm air trapping, demonstrating that the left lung fails to deflate. Chest CT reveals a soft tissue mass obstructing the left main bronchus.
Key takeaways
Endobronchial lesions can present with highly subtle radiographic findings, including persistent focal hyperlucency and air trapping on expiration due to a ball-valve mechanism. Slowly growing airway neoplasms such as mucoepidermoid tumors can cause chronic, incomplete airway obstruction and should be considered when focal, non-clearing hyperlucency or matched V/Q scan defects are identified.
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