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Dear Steve,
Vasectomy is a very common and safe procedure. It is highly effective at preventing pregnancy. The incidence of complications including bleeding, infection and/ persistent sperm are quite low. Estimates range from 1 to 5 %. You are unfortunately in that small percentage of patients that has had a complication. The condition you describe is called a post-vasectomy hematoma. Blood vessels surrounding the vas deferens can bleed. Since the scrotum is a very pliable sac, the accumulation of blood can be quite large(even cantaloupe size).
Since your pain has been quite severe and has not subsided with drain placement or time, it might be worthwhile to consider a trip to the operating room to try to remove the large amount of clot within your scrotal sac. Once, the blood hardens, drains are not sufficient to allow egress of the blood. Also, if the blood has dispersed into the tissues, it cannot be drained. If you elect to continue to allow resorption of the hematoma over time, the size of your scrotum will eventually go down although it may never be exactly the same size as it was prior to vasectomy/hematoma.
This information is provided for general medical education purposes only. Please consult your physician for diagnostic and treatment options pertaining to your specific medical condition. More individualized care is available at the Henry Ford Hospital and its satellites (1 800 653 6568).
HFHS MD-KR
*keyword: vasectomy, hematoma