Normal Variants - CHEST
Normal variants are 'abnormalities' on the chest radiograph which do not represent underlying pathology and are therefore nroaml variations in the spectrum of healthy. They can be confused for pathology and are particularly common in exams where the wiley examiner is trying to lead the candidate down a path of over calling pathology.
Normal variants are a good test of whether an exam candidate has a wide exposure to reading real life films rather than just textbook cases.
Aberrant right subclavian artery, azygos lobe and left sided SVC are described.
Please note at 04.08 the description of the azygos fissure should state that there are 4 pleural layers - 2 visceral and 2 parietal.