Describe the abnormality on the chest radiograph.
There is a well-defined cystic lesion in the right upper zone. It has a thick wall and an air-fluid level.
What lobe is the lesion in and how can you place it there?
The lesion is in the upper zone and on the AP radiograph it is above the horizontal fissure; it is therefore located in the right upper lobe.
For radiology-geek bonus-points what is the segmental anatomy of the right upper lobe?
The right upper lobe is split into 3 bronchopulmonary segments: the anterior, posterior and apical segments.
What is the differential diagnosis for this cyst with its air-fluid level.
The differential diagnosis includes a pneumatocoele, abscess and a congenital cystic lung lesion
There is a well circumscribed rounded cystic mass in the right upper lobe. The walls are moderately thick and there is an air-fluid level.