Best option for correction of lopsided abdominal bulge after DIEP flap caused by weakening of fascia? (Photos)

Even though you had a deep flap and the muscle was preserved, it still can weaken the muscle and cause  a weakness on the affected side. You probably need a CT to make sure that it is just a weakness. Often reinforcement with mesh will be adequate.

Thank you for your question, and I'm sorry for what you're going through.  I suspect this is abdominal wall weakness.  However, if you were my patient, I would start with a CT scan to better evaluate the issue.  Best of luck with your recovery.