Granulomatous disease means an illness that causes granuloma to form in the tissues of the body. A hilar node is a lymph node that sits in the hilar area of the lungs, the hilar region is the area that all the major ducting enters an organ, in this case the lungs. The main diseases that cause granuloma to form in the lungs, and/or lung lymphatics are active Tuberculosis, and Sarcoidosis. There is other infectious diseases like Histoplasmosis which is a fungal infection, but TB, and Sarcoid are the most common causes of granulomatous disease of lung.
If you had active TB you would have been symptomatic, and known about it, so that seems unlikely. To really be at risk for Histo you'd have to be around bird poop in the tropics, so that isn't very likely either. So I would put Sarcoidosis at the top of the suspect list. They say about a third of the people with Sarcoid are sub-clinical. Basically it's discovered by accident on a routine chest x-ray, and the patient wasn't aware of any lung problems. The effected lymph nodes eventually calcifying is really common in Sarcoid.
Do you ever remember around the time you were thirty, give or take five years, having your ankles hurt, and swell up, or red sore bumps suddenly erupt on your skin ? Or any strange symptoms that lasted a few months, and then got better ?
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