What kind of complications might happen from a microsurgical epididymal sperm aspiration?

Sperm Aspiration. Sperm aspiration works best for obstructive (blocked) azoospermia, such as after vasectomy or infection. We aspirate sperm from the testicle or epididymis and the choice of site is more related to the doc. The risks are very small: anesthesia, bleeding/hematoma, and discomfort. I find these very uncommon. The small tubules of epididymis could get blocked (already a problem). Review with doc.
Not many. Theorhtically there could be entry into a blood vessel causing a blood collection called a hematoma. We always put ice arouond the biopsied area to prvent excessive swelling.