Thanks for your query.Based on the facts that you have posted it appears that you have undergone surgery for repair of ventral Hernia
and a mesh was put while repairing the defect.
However there is recurrence of hernia detected on C.T scan .This is not uncommon and happens mostly due to weakness of the muscles of the anterior abdominal wall.
The mesh that is commonly used is a prolene
mesh which is soft and flexible and no hard mesh is used to repair any hernia.
Please go ahead and get the surgery done .