Percutaneous Epididymal Sperm Aspiration (PESA) PESA is a procedure performed for men who are having sperm retrieved for IVF/ICSI who have obstructive azoospermia from either a prior vasectomy or infection.
TESE ICSI (Testicular / Epididymal Sperm Aspiration or Extraction) … In this procedure, a small amount of testis tissue is taken by biopsy under local anesthesia. It is a breakthrough in that it demonstrates that sperm do not have to “mature” and pass through the epididymis in order to fertilize an egg.
In some men, the production of sperms in the testis is very low and no sperms are seen in the semen. TESA is a way of obtaining the few sperms that are available in the testis. Using local anaesthesia, a needle is inserted into the testis to obtain some tissue. This tissue is carefully dissected in the laboratory and the few sperms obtained may be used for ICSI or frozen for later use.