Adrenalectomy: Surgical Approaches, Prep, and Recovery

Adrenalectomy is the surgical removal of one or both adrenal glands, most commonly performed to treat hormone-producing tumors or to rule out cancer. The procedure has shifted dramatically over the past three decades, moving from large open incisions to minimally invasive techniques that let many patients go home within a day or two. Despite these advances, adrenalectomy remains a procedure with significant nuances: the reason it is being done, the surgical approach chosen, and the hormonal aftermath all shape the experience and outcome in ways worth understanding before you or someone you know heads to the operating room.

Why the Adrenal Glands Come Out

The adrenal glands sit on top of your kidneys and produce hormones your body depends on, including cortisol, aldosterone, adrenaline, and small amounts of sex hormones. Surgery becomes necessary when one of these glands starts overproducing hormones or when imaging raises concern about cancer. The indications fall into a few broad categories: tumors suspected to be malignant, nonfunctional tumors large enough to carry a risk of malignancy, and hormone-secreting tumors regardless of size.¹

Among the hormone-secreting tumors, three conditions account for most adrenalectomies. Cushing’s syndrome results from excess cortisol and causes weight gain, high blood sugar, thinning skin, and muscle weakness. Conn’s syndrome (primary aldosteronism) involves excess aldosterone, driving up blood pressure and depleting potassium. Pheochromocytomas produce surges of adrenaline-like hormones, causing episodes of dangerously high blood pressure, rapid heart rate, and sweating.² In rarer cases, tumors that secrete excess androgens or estrogens also warrant removal.

The Size Question for Incidental Findings

Many adrenal tumors are discovered accidentally on a CT or MRI done for an unrelated reason. These so-called incidentalomas pose a dilemma: most are benign and harmless, but the larger they are, the higher the chance they harbor cancer. Most guidelines use 4 cm as the threshold at which surgery should be considered, though there is real disagreement across centers; some surgeons observe tumors up to 6 cm if imaging features look reassuring, while laparoscopic removal has been reported for tumors ranging from under 4 cm up to 12 cm depending on the institution.³ The decision is never based on size alone; imaging characteristics, whether the tumor is producing hormones, and how quickly it is growing all factor in.

Open Surgery Versus Minimally Invasive Approaches

Until the early 1990s, adrenalectomy meant a large incision across the abdomen or flank. Open adrenalectomy is still performed today, but it has been largely replaced by minimally invasive options for most benign and small tumors. There are now several competing techniques, each with trade-offs.

Laparoscopic Transperitoneal Adrenalectomy

This is the most widely practiced minimally invasive approach. The surgeon works through small incisions in the abdomen using a camera and long instruments. It provides a familiar view of the anatomy and enough working space for most tumors. It became the default approach in the late 1990s and remains common worldwide.

Posterior Retroperitoneoscopic Adrenalectomy

Rather than going through the abdominal cavity, this technique enters from the back, accessing the adrenal gland through the space behind the lining of the abdomen. A randomized trial with five-year follow-up found that the posterior approach led to shorter operative times (about 51 versus 77 minutes), less blood loss, faster return to eating and walking, less shoulder-tip pain, a shorter hospital stay, and lower overall cost compared to the standard laparoscopic route.⁴ Herniation at the incision site was also essentially eliminated with the posterior approach, occurring in none of those patients compared with about one in six after the transperitoneal route. A meta-analysis confirmed the pattern, showing less blood loss and a shorter hospital stay with the posterior approach.⁵ The main limitation is a smaller working space, which makes it less suited for very large tumors or patients who have had previous kidney surgery on that side.

Robotic Adrenalectomy

Robotic-assisted surgery uses the same small incisions as conventional laparoscopy but adds a robotic platform that gives the surgeon more precise instrument control and a three-dimensional view. A recent meta-analysis found that the robotic approach outperformed conventional laparoscopy on several measures: less blood loss, a shorter hospital stay, faster bowel recovery, fewer conversions to open surgery, and fewer total complications.⁶ The advantages were particularly clear for patients with large tumors (5 cm or bigger), obesity, or pheochromocytomas. Operative time was comparable between the two, though individual center data sometimes shows longer times for robotic cases.⁷ A propensity-matched study found that the learning curve for robotic adrenalectomy is surprisingly short, leveling off after about five or six procedures, and that the shorter hospital stay offset the slightly higher cost of robotic disposable instruments.⁸

When Open Surgery Is Still the Better Choice

For suspected adrenocortical carcinoma, the calculus changes. Adrenal cancer is aggressive, and the primary goal of surgery is to get clear margins without spilling tumor cells. In a study comparing the two approaches for this cancer, patients who had laparoscopic removal had a 30% rate of positive margins or tumor spill during surgery, compared with 16% in the open group. Patients with stage II adrenal cancer who had open surgery survived longer and had a longer interval before the cancer returned near the surgical site.⁹ Another retrospective study found that disease-free survival after open removal averaged roughly 45 months versus about 18 months after laparoscopic removal, and every patient in the laparoscopic group showed local recurrence as the first site of relapse.¹⁰

A meta-analysis concluded that open surgery remains the standard for adrenal cancer, though minimally invasive removal can play a role in carefully selected cases where the tumor is small and appears well-contained.¹¹ The takeaway: if there is genuine suspicion of adrenal cancer before surgery, most experienced centers will recommend an open approach.

Preparing for Surgery When You Have a Pheochromocytoma

Pheochromocytomas require special preoperative preparation because the tumor dumps catecholamines (adrenaline and noradrenaline) into the bloodstream. Manipulating the gland during surgery can trigger extreme blood pressure spikes, so patients are placed on blood-pressure-lowering medications for one to several weeks beforehand. Even patients whose blood pressure reads normal before surgery need this preparation.

The classic drug used is phenoxybenzamine, which broadly blocks alpha receptors and does a good job of controlling blood pressure swings during the operation itself. The downside is that its effects linger after the tumor is out, leading to prolonged low blood pressure in the recovery room, along with side effects like reflex tachycardia and drowsiness. Newer, selective alpha-blockers such as doxazosin and terazosin offer less dramatic intraoperative control but cause fewer problems afterward.¹² The choice between these strategies depends on the surgeon’s and anesthesiologist’s preferences and on the individual patient’s cardiovascular picture.

Complications and Risks

Adrenalectomy is major surgery, and complications do occur. Historically, complication rates have been reported as high as 40%, with mortality around 2 to 4%, though those figures reflect an era when open surgery dominated and many patients had advanced disease.¹³ Modern minimally invasive techniques have driven mortality down substantially. A large study of trends over time found that overall 30-day mortality is now about 0.3%, although complication rates have actually risen modestly (from roughly 8% to 15% across the study period), likely because the patient population has shifted to include more complex cases.¹⁴

The most common problems fall into a few categories: injury to nearby structures (the spleen, pancreas, kidney, or large blood vessels), postoperative infection, blood clots, and adrenal insufficiency. Variant anatomy of the adrenal veins, present in roughly one in eight patients in one large series, is associated with larger tumors, more blood loss, and a higher rate of pheochromocytomas, though it does not significantly increase the need for blood transfusion or reoperation.¹⁵

The Hormone Gap After Surgery

When only one adrenal gland is removed, the remaining gland normally takes over hormone production, and most patients do not need long-term replacement medication. The exception is Cushing’s syndrome. Because the overactive gland has been flooding the body with cortisol, the other gland has been suppressed and may take months (sometimes over a year) to wake up. Patients need steroid replacement in the interim, and adrenal crisis during tapering is a real danger.

One case report illustrates the problem: a patient who received a standard postoperative dose of hydrocortisone (30 mg per day) developed nausea and fatigue severe enough to require emergency care on day 15, and ultimately needed much higher doses before a slow taper was possible.¹⁶ In a comparative study of hydrocortisone versus prednisone for glucocorticoid replacement after Cushing’s surgery, both groups experienced episodes of adrenal insufficiency during the withdrawal process, with most episodes manageable by returning to a higher dose. Two severe cases required hospitalization.¹⁷ Anyone going through this should carry medical identification indicating steroid dependence and understand the symptoms of adrenal crisis: severe fatigue, nausea, dizziness, and low blood pressure.

When both adrenal glands are removed, as sometimes happens in Cushing’s disease caused by a pituitary problem, lifelong cortisol and aldosterone replacement becomes mandatory. Patients in this situation also face a risk of Nelson’s syndrome, in which the pituitary tumor that originally drove the Cushing’s disease grows aggressively after the adrenal feedback signal is eliminated. Quality of life after bilateral adrenalectomy for Cushing’s disease does improve for most patients: at a median of about 29 months of follow-up, roughly nine out of eleven patients in one survey said their health had improved, and Cushing’s-related symptoms got better across the board, though their overall quality-of-life scores still lagged behind those of the general population.¹⁸

Outcomes for Primary Aldosteronism

For Conn’s syndrome, the goals of surgery are to normalize potassium, reduce blood pressure, and ideally let you stop taking blood-pressure medications. The biochemical side of this works well: excess aldosterone is corrected in the vast majority of patients. In one UK center, complete biochemical success was achieved in about 96% of patients in both the short and long term.¹⁹

Blood pressure improvement is more variable. A large international study classified outcomes at follow-up and found that roughly 27% of patients achieved a complete cure (normal blood pressure off all medications), about 31% had clear improvement (lower blood pressure or fewer medications), and around 42% showed no clear success by those strict criteria.²⁰ Even in that last group, blood pressure did drop somewhat and the number of medications was cut roughly in half. A separate study found that complete remission of hypertension at six months was only about 11%, rising slightly to about 14% by two years, though partial remission was seen in 43 to 46% of patients.²¹

The honest picture: surgery reliably fixes the aldosterone problem, but if your blood pressure was high for years before diagnosis, the damage to blood vessels and kidneys does not fully reverse. Younger patients, those with shorter duration of hypertension, and those taking fewer medications preoperatively tend to do best. Going in with the expectation that you will likely still need some blood-pressure medication, just less of it, is more realistic than expecting a complete cure.

Partial Adrenalectomy

In certain situations, surgeons remove only the tumor and a margin of normal tissue rather than the entire gland. This cortical-sparing approach is most compelling when both adrenal glands are affected, as in hereditary pheochromocytoma syndromes (like multiple endocrine neoplasia type 2 or von Hippel-Lindau disease), because removing both glands entirely sentences the patient to lifelong steroid replacement. The trend toward partial removal is straightforward in bilateral disease, where avoiding steroid dependence is a major benefit.²²

A systematic review and meta-analysis of partial adrenalectomy for pheochromocytoma found that only about 8% of patients needed steroid supplementation afterward, a dramatically lower rate than after total removal. The trade-off is a higher recurrence rate: the tumor came back more often with partial removal. The rates of biochemical cure and surgical complications, however, were similar between the two strategies.²³ For patients with hereditary syndromes who face the prospect of repeated operations over a lifetime, accepting a somewhat higher chance of recurrence in exchange for keeping their own cortisol production is often the right trade.

Same-Day Discharge

One of the more surprising developments in adrenalectomy is that selected patients can now go home the same day. At two academic centers, about half of patients undergoing minimally invasive adrenalectomy were managed as outpatients. Outpatient discharge was more common for patients with smaller, less hormonally active tumors (particularly aldosterone-producing adenomas) and when surgery finished before mid-afternoon. There was no increase in 30-day readmission or complication rates for the outpatient group.²⁴ A prospective matched study confirmed that same-day discharge is feasible and safe for appropriately selected patients with primary aldosteronism and Cushing’s syndrome.²⁵ Patients with pheochromocytoma or metastatic disease are generally not candidates for same-day discharge because they need closer hemodynamic monitoring.

Adrenalectomy During Pregnancy

Adrenal tumors diagnosed during pregnancy create a high-stakes situation. The tumor’s hormonal effects (dangerously high blood pressure from a pheochromocytoma, cortisol excess from Cushing’s) threaten both the mother and the fetus, but so does surgery during pregnancy. A 15-year experience from a tertiary referral center reviewed 12 women who underwent adrenalectomy while pregnant. Maternal mortality was zero, but preterm birth occurred in 7 of the 12 cases and intrauterine growth restriction in 3. Ten of the 12 women had healthy babies. Outcomes were worse when the indication for surgery was a malignant lesion or Cushing’s syndrome.²⁶ Laparoscopic surgery was feasible in these patients, and the general approach is to operate in the second trimester when possible, as the risk of miscarriage is lower than in the first trimester and the uterus is not yet large enough to limit surgical access.

Adrenal Surgery in Veterinary Medicine

Adrenalectomy is not exclusive to human patients. Among companion animals, ferrets are particularly prone to adrenal disease. Hyperadrenocorticism in ferrets causes hair loss, enlarged prostate in males, and vulvar swelling in females, and surgical removal of the affected gland or glands is the primary treatment. A study of 130 ferrets treated surgically for the condition found a good prognosis overall. Survival was not affected by whether the tumor was benign or malignant on biopsy, whether one or both glands were involved, or whether the gland was completely versus partially removed. Even debulking (removing as much tumor as safely possible without complete excision) provided favorable long-term outcomes when complete removal was not feasible.²⁷ Dogs also undergo adrenalectomy for adrenal tumors, though the anatomy is more challenging due to the proximity of the adrenal glands to the vena cava, and the complication rate in dogs tends to be higher than in ferrets.