I found out during a ct heart angio in may that i have a 4 mm calcified nodule, possibly on my intrapulmonary lymph gland. i am worried that it's lung cancer. i did not do a follow up. what should i do?

Relax: 95% of nodules seen on ct scan are benign. Nodules <7mm are usually just observed. The usual course of action is to get another scan 3-6 months later to check for a change in size. If it is bigger, then biopsy or resection would be appropriate.

Possible: But quite small. Hard to biopsy at that size. Full history, and complete exam necessary. Repeat ct 3 months. If change-then open biopsy.