There is a fullness in the left apex (arrows). Compare that to the corresponding right side which is clear. Could this be an apical mass? A Pancoast tumour perhaps?
Well, she is only 23, a non-smoker and no brachial plexus symptoms. What is your diagnosis?
Actually its just her hair bun! Look closely at this close-up image. The 'mass' extends up to the lower part of her neck.
Sorry folks - it is not Pancoast tumour.