My Husband Had CT Of The Chest. It Showed A

My husband had CT of the chest. It showed a nodule on his lung, a spot on his liver, and described lymph nodes this way. He has seen his PCP who recommends a biopsy of the lymph nodes and "something else" that he can remember but is dragging her feet in making the arrangements/referrals. He wants to contact someone himself and needs to know what specialty is appropriate to start with. Suggestions?