First appointment

Against all my better judgment I find myself here. I am a mom and 24 hours ago in a fluke trip to the ER it was discovered that my infant has calcification of the “adrenal gland/ malignant finding/ unidentified mass”. I’ve heard all those words and no explanation. Anyways, tomorrow we are driving to a larger hospital in our area to see the pediatric oncologist. What can I expect? Tell me everything. I assume it’ll be a long day. From the ER we did two different series of X rays & then ultrasound. He’s 11 months. I’m terrified out of my mind. Any reassurance would be appreciated but I really just want to know what to expect at the first visit.