I would like to know what prompted you to get a chest X-ray?
Are you feeling sick?
If so, then what are your complaints?
Hilar prominence on a chest X-ray is seen in several medical conditions but it has to be correlated clinically.
Giving a differential diagnosis will only set you off on a goose chase.
Next Steps
Consult your local doc or else do a Practo Consult with a pulmonologist.