Intrathecal Morphine Versus Intravenous Methadone for Postoperative Analgesia Following Retroperitoneal Lymph Node Dissection.

This study is comparing two pain management methods after surgery to remove lymph nodes from the abdomen (retroperitoneal lymph node dissection) for testicular cancer: morphine injected into the spinal fluid versus methadone given through an IV. **You may be eligible if...** - You are a male between 18 and 80 years old - You are scheduled for retroperitoneal lymph node dissection for testicular cancer - Your BMI is under 50 - Your overall health falls within acceptable anesthesia risk levels (ASA class 1-3) **You may NOT be eligible if...** - You have any reason you cannot safely receive spinal anesthesia - You currently take methadone at home - You have a drug or opioid use history in the past 6 months - You have severe liver or kidney disease - You are allergic to morphine, bupivacaine, acetaminophen, or methadone - You are already taking more than 30 mg of oral morphine equivalents per day Talk to your doctor to see if this trial is right for you.