Hello and welcome to HCM
ALV stands for apicolordotic view.
This is a X-ray done from a particular direction to have a better view of the abnormality or an opacity seen on PA view (the X-ray which your father has already had). Radiologists order ALR when some abnormality is seen on routine X-rays (density in upper lung in your case).
This density could be due to dust or it may be an artifact or even a scar due to previous tuberculosis
. To find out what exactly it is, ALV is ordered. It does not imply that your father is definitely having some disease.
Besides this there is atherosclerotic plaque
. This means that there is deposition of fat in the vessel wall. Deposition of calcium over the fat has caused it to be visible on X-ray film.
Thanks and take care
Dr Shailja P Wahal