Presentation
Incidental findings. Metastatic workup.
Patient Data
There is a well-defined, hyperattenuating nodule-like lesion in the vicinity of the apicoposterior segment of the left upper lobe, which is most likely a mucus plug in the atretic bronchiole with surrounding hyperinflated parenchyma or air-trapping.
The patient is a known case of rectal adenocarcinoma.
A small pleural-based nodule in the left lower lobe is newly found and is too small for characterization (needs follow-up).
the red arrow demonstrates (on single a hyperlucent area in the territory of the left apicoposterior segment
the green arrow demonstrates the most likely mucus impaction in the segmental bronchus prior to the above-mentioned hyperlucent area
Case Discussion
Current CT findings are concerning for bronchial atresia (sub-segmental) in the left upper lobe (well visualized on minimum intensity projection).
Bronchial atresia is a congenital/developmental disorder that is characterized by focal obliteration of the proximal segment of the bronchus and demonstrates either segmental or sub-segmental (as in this case).
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