Last Friday, I went in for a cardiac catheter procedure. I have hypertensive cardiomyopathy and 2nd degree AV block type 2. The procedure was to assess the state of my arteries before determining the need for a pacemaker. At that time, the cardiologist found a "mass" located directly behind my heart. I was immediately sent for an MRI the same day. The cardiologist there concluded that I have a posterior mediastinal tumor approximately 4.5cm in size directly behind the heart. Both main arteries run to this "very vascular" tumor. I am being referred to a thoracic surgeon Monday. Has anyone else had experience with this? I am relatively sure it is a neurogenic tumor of some kind which tend to be benign, but considering it is tied into my arteries and I have had loads of symptoms (back pain, chest pain, bradycardia, tachycardia, fatigue, dizziness, etc) I am slightly concerned. I am also not sure how it can be operated on considering its location. Any advice would be appreciated.