Methods: This retrospective study reviewed electronic medical records of Tuen Mun Hospital, Hong Kong, from 2002 to 2024 to include all cases with the diagnosis of CTM confirmed through computed tomography (CT). Cases were categorised into the antenatally diagnosed (AN) group and postnatally diagnosed (PN) group for further analysis.

Results: The cohort analyzed 45 cases, of which 18 belonged to the AN group and 27 belonged to the PN group. The majority of patients in the AN group remained asymptomatic throughout follow-up (61.1%); 48.2% of the PN group presented as incidental findings. Pneumonia was the most common complication, affecting 33.3% of the AN group and up to 59.3% of the PN group. Most of the patients had a single uncomplicated pneumonia (AN group: 83.3%; PN group: 75%). Surgeries were performed in 44.4% of the AN group and 66.7% of the PN group, with notable postoperative complications observed (AN: 25%, PN: 22.2%). Importantly, only one case of lymphoepithelioma-like carcinoma in a patient with bronchopulmonary sequestration (BPS) was identified, and no malignancies were found in other CTM entities.

Conclusion:  In view of the relatively indolent and benign course found in this study, a conservative approach with surgery at a later age could be an alternative to early surgery in asymptomatic CTMs.