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Needle aspiration of the epididymis causes rupture and irreversible damage to the duct. Recurring punctures and needle aspirations of fluid and tissue during Testicular Fine Needle Aspiration (TEFNA) procedure cause irreparable injury and loss of part of the testis' tubules. The hypothesis of this research is that production of sperm from the testis will be improved due to ultrasonically guided Rete Testis needle aspiration. In cases of Obstructive Azoospermia, the Rete Testis is expected to contain a large number of sperm cells. In cases of Non-Obstructive Azoospermia, the investigators can expect to produce sperm cells from aspiration of the Rete Testis, which drains all of the testis' tubules. Furthermore, catheterization of the Rete Testis will allow for the drainage of all testes tubules and for the production of sperm cells created locally in some of the tubules or in parts of them
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