Question for radiologist. i had u/s done. what causes a small complicated breast cyst (no solid mass component) to be more "tall than wide"?

Scarring?: Without seeing the images, I cannot give you more than a general response. If a cysts has sharp margins that is a typically benign lesion. As I am radiologist, I would want to know why it is complicated. Without knowing this, I would recommend that you have a followup sonogram in 3 months. If it is stable for a year. you shouldn't need any additional follow up.