胸CT和脑MRI都有可能发现新的囊肿。比如脑垂体，

"Pituitary incidentalomas are found in at least one in 10 persons and are clinically significant in approximately one in 1,000."

https://www.ncbi.nlm.nih.gov/pubmed/22305449

所以看到你做新的检查有点替你捏了把汗。但是知道你是回顾几年前的事，目前身体无大碍，因此昨天按下没说。
做了此二项检查all clear，现在回看当然是好事。