lymph node biopsy

A rheumatologist trying to confirm sjogren's syndrome because of bilateral parotitis and dry eyes had a x-ray taken of my son's chest in July.The X-ray suggested the possibility of bilateral hilar adenopathy and subcarinal adenopathy with prominent intestitial markings. a cat scan in sept. was still abnormal.Yesterday he saw a pulmonalogist and he thinks it is sarcoidosis and not sjogrens. He is talking about a lymph node biopsy in the chest to rule out lymphoma because the lungs are clear.(a scope would not show anything) He is feeling great-no weight loss-or illness. my questions are: can you have both sjogren's and sarcoidosis which from my readings on the internet both can cause hilar adenopathy? obviously wanting the biopsy to be the last resort, are there any other non invasive tests to rule out lymphoma before consenting to the biopsy? Is there a safe period of watchful waiting-?-if he had not had the x-ray he certainly would not have known of the problem. thank you very much.

[National Jewish]

Your son could have both Sjogren