A Rare Presentation of Low-Grade Mucoepidermoid Carcinoma in a Young Male

Mucoepidermoid Carcinoma (MEC) is a rare tumor of the lung. In this case, we report an 18-year-old male patient who had an ongoing cough, green expectoration and chest pain for more than 3 months. An irregular nodular lesion with no fluorine-18 ?uorodeoxyglucose (18F-FDG) uptake in the lower lobe of the left lung was found on positron emission tomography/computed tomography (PET/CT). In the diagnostic impression, we made a misdiagnosis of lung infection (pneumonia). Histopathological result however revealed the lesion was a lowgrade MEC. This case was an uncommon and challenging one which should prompt diagnostic imaging specialists to consider this rare malignant disease as one of the differential diagnosis when assessing young adults presenting with a history of repeated cough and a confirmed lung lesion which shows no improvement with standard treatment.