Thank you for the opportunity to help you with your question!
Transabdominal procedure differs from c-section from the stitch which has to hold the baby at the cervix( owing to cervical insufficient), but similar to c-section because the access is made through the abdomen.
Transvaginal refers to the process of reaching the cervix through the vagina and stitching.
Please let me know if you need any clarification. I'm always happy to answer your questions.