Feline Adrenocortical Carcinoma: Aggressive Adrenal Cancer

1. Why this topic matters for cat owners

Most cat owners are familiar with common problems like dental disease, kidney issues, or diabetes. Adrenal cancer is much rarer, but it can cause big changes in your cat’s body because the adrenal glands control critical hormones. When an adrenal tumor becomes cancerous (an adrenocortical carcinoma), it may grow aggressively, invade nearby tissues, or spread to other organs. Some adrenal tumors also overproduce hormones, leading to serious complications that can look like “normal aging” at first—weight changes, drinking more water, a pot-bellied look, or weakness.

Knowing the early warning signs can help you seek veterinary care sooner, when more options may be available. If your cat is acting “off” for more than a day or two—especially with appetite, energy, thirst, urination, or breathing—calling your veterinarian is always the right move.

2. Overview: what is feline adrenocortical carcinoma?

Cats have two adrenal glands—one near each kidney. These small glands make hormones that regulate:

• Stress response (cortisol)
• Blood pressure and salt/water balance (aldosterone)
• Sex hormones (androgens/estrogens in small amounts)

Adrenocortical carcinoma (ACC) is a malignant (cancerous) tumor arising from the cortex (outer layer) of the adrenal gland. ACC in cats is uncommon, but when it occurs it can be:

• Non-functional: it doesn’t overproduce hormones, and signs come mostly from the mass effect (pressure on nearby organs) or spread.
• Functional: it produces excess hormones, causing a recognizable syndrome such as:
  • Hyperadrenocorticism (Cushing’s disease): too much cortisol (rare in cats, but serious).
  • Hyperaldosteronism (Conn’s syndrome): too much aldosterone, often causing low potassium and high blood pressure.

Because the adrenal glands sit close to major blood vessels, kidneys, liver, and the vena cava (a large vein), adrenal tumors can be challenging. Some adrenal cancers also invade blood vessels or spread (metastasize) to the liver, lungs, lymph nodes, or other tissues.

3. Symptoms and warning signs to watch for

Signs vary based on whether the tumor is producing hormones and how large or invasive it is. Many symptoms are subtle at first. Contact your veterinarian if you notice any of the following.

General signs (can occur with functional or non-functional tumors)

• Reduced appetite or picky eating that is new
• Weight loss or muscle loss
• Low energy, hiding more, decreased interest in play
• Vomiting or nausea (lip licking, drooling, “meatloaf” posture)
• Weakness, wobbliness, trouble jumping
• Abdominal enlargement or discomfort

Signs linked to excess cortisol (Cushing’s-like signs)

• Increased thirst and urination
• Increased appetite (sometimes) with weight/muscle loss
• Thin skin, fragile skin, easy bruising
• Hair coat changes, hair loss, poor coat quality
• Recurrent infections (skin, urinary tract), slower healing

Signs linked to excess aldosterone (often more common in cats than cortisol excess)

• Severe weakness, ventroflexion (neck bent down), tremors due to low potassium
• High blood pressure signs: sudden blindness, dilated pupils, disorientation
• Increased thirst and urination
• Heart murmur or abnormal heart rhythm (from electrolyte changes)

Red flags that deserve prompt veterinary attention

• Sudden collapse, profound weakness, or inability to stand
• Sudden blindness or bumping into things
• Labored breathing, pale gums, or a swollen painful abdomen
• Repeated vomiting, not eating for 24 hours (or 12 hours for kittens)

4. Causes and risk factors

In most cats, a single clear cause isn’t identified. Cancer can develop from genetic changes inside cells over time. That said, veterinarians watch for patterns that can increase suspicion.

Potential risk factors and associations

• Age: adrenal tumors are more often found in middle-aged to older cats.
• Underlying endocrine disease: cats with diabetes or other hormone-related problems may be evaluated more closely when symptoms don’t fit the usual pattern.
• High blood pressure or low potassium: these findings raise concern for aldosterone-producing adrenal tumors.
• Chronic steroid exposure: long-term corticosteroid medication can mimic Cushing’s signs, but it does not directly equal adrenal cancer. Your veterinarian will sort out medication effects versus true adrenal disease.

Most importantly: nothing you did “caused” this. If your cat is diagnosed with ACC, focus on next steps and supportive care.

5. Diagnosis: methods and what to expect at the vet

Adrenal cancer is not diagnosed based on one test alone. Your veterinarian will combine history, physical exam, lab work, and imaging.

What your vet visit may include

• History and symptom review: thirst/urination, appetite, weight, behavior changes, medications.
• Physical exam: body condition, muscle loss, hydration, abdominal palpation, coat/skin, heart and lungs.
• Blood pressure measurement: especially important if weakness, eye changes, or kidney issues are present.

Common lab tests

• CBC (complete blood count): checks for infection, inflammation, anemia.
• Biochemistry panel: evaluates liver and kidney values, glucose, and electrolytes.
• Electrolytes (potassium, sodium): low potassium can be a major clue for aldosterone excess.
• Urinalysis +/- urine culture: looks for infection, diabetes-related changes, kidney concentration ability.

Hormone testing (chosen based on suspected syndrome)

• Aldosterone level (often paired with renin or interpreted alongside potassium and blood pressure).
• Cortisol testing: tests such as low-dose dexamethasone suppression or ACTH stimulation may be used in select cases. Cats can be tricky, so your veterinarian may recommend referral to an internal medicine specialist.

Imaging

• Abdominal ultrasound: a key tool to visualize adrenal size, shape, and invasion; checks liver and lymph nodes.
• CT scan: often recommended before surgery to map the tumor and nearby vessels; helps with surgical planning and staging.
• Chest X-rays: looks for metastasis to lungs and evaluates heart/lung status before anesthesia.

Confirming cancer

A definitive diagnosis of carcinoma is often made after surgical removal and biopsy (histopathology). Needle sampling of adrenal tumors is not always recommended due to bleeding risk and limited diagnostic yield, and because the adrenal sits near major vessels.

6. Treatment options (medical, surgical, home care)

Treatment depends on whether the tumor is functional, whether it has spread, and your cat’s overall health (especially heart and kidneys). Your veterinarian may recommend referral to a surgical specialist and/or internal medicine specialist.

Surgical treatment

• Adrenalectomy (removal of the affected adrenal gland) is the main treatment when the tumor is localized and surgery is feasible.
• Surgery can be complex due to proximity to major blood vessels; advanced imaging and an experienced surgeon improve safety.
• Post-op monitoring is essential: blood pressure, electrolytes, and hormone balance can shift quickly.

If the tumor is producing hormones, surgery may offer the best chance to remove the source and reduce medication needs long term, but it is not risk-free. Your vet team will help you weigh benefits and risks based on imaging and staging results.

Medical management

Medical therapy may be used to stabilize your cat before surgery, manage symptoms if surgery isn’t possible, or support quality of life.

• For aldosterone-producing tumors:
  • Potassium supplementation (often critical for strength and mobility)
  • Blood pressure medications (commonly amlodipine)
  • Mineralocorticoid receptor blockers (such as spironolactone) in appropriate cases
• For cortisol excess:
  • Medications to reduce cortisol production may be considered in select cases, with careful monitoring.
  • Managing secondary issues: diabetes control, skin infections, urinary tract infections.
• Pain control and nausea support: appetite stimulants, anti-nausea medication, and pain relief as prescribed.

Chemotherapy is not commonly standardized for feline ACC; an oncologist can advise if cancer has spread or if there are options for your cat’s specific situation.

Home care you can do right away

• Track daily habits: appetite, water intake, litter box output, energy level, and any vomiting.
• Give medications exactly as prescribed and don’t stop suddenly unless your veterinarian directs you to.
• Reduce stress: keep routines predictable; provide quiet resting areas and easy access to food, water, and litter boxes.
• Support safe mobility: add pet stairs/ramps, use low-entry litter boxes, place non-slip rugs on slick floors.
• Diet: follow your veterinarian’s guidance, especially if kidney disease, diabetes, or high blood pressure is also present.

7. Prevention strategies and early detection tips

There is no guaranteed way to prevent adrenal cancer, but you can improve early detection and reduce complications from hormone imbalances.

• Schedule regular wellness exams (at least yearly for adult cats; every 6 months for seniors).
• Ask for baseline senior bloodwork and blood pressure checks—high blood pressure often goes unnoticed until it affects the eyes or kidneys.
• Watch for subtle trends rather than single events:
  • Gradual weight loss
  • Drinking more water
  • New weakness or reluctance to jump
  • Coat/skin changes
• Bring a symptom log to your appointment (dates, frequency, photos of litter clumps, short videos of weakness or wobbliness).

8. Prognosis and quality of life considerations

Prognosis varies widely. Key factors include:

• Whether the tumor can be fully removed
• Evidence of invasion into vessels or nearby tissues
• Whether cancer has spread to other organs
• How severe the hormone effects are (blood pressure, potassium levels, diabetes control)
• Overall health (kidney function, heart status)

Many cats feel significantly better once blood pressure and electrolytes are stabilized—sometimes within days to weeks. If surgery is successful and disease is localized, cats may enjoy meaningful good-quality time. When cure isn’t possible, comfort-focused care can still provide a good quality of life by controlling nausea, pain, blood pressure, and weakness.

A practical way to monitor quality of life at home is to score daily:

• Eating (normal, reduced, none)
• Mobility (jumping, walking steadily, using the litter box)
• Comfort (hiding, vocalizing, resting calmly)
• Breathing (normal vs. effortful)
• Good days vs. bad days over a two-week period

Share these notes with your veterinarian; it helps guide adjustments in care.

9. When to seek emergency veterinary care

Seek emergency care right away (ER clinic if your regular vet is closed) if your cat has:

• Sudden blindness, dilated pupils, or rapid onset disorientation
• Collapse, inability to stand, severe weakness, or tremors
• Labored breathing, open-mouth breathing, or blue/pale gums
• Distended, painful abdomen or signs of acute shock (cold paws/ears, extreme lethargy)
• Repeated vomiting or refusal to eat plus lethargy
• Suspected high blood pressure crisis (acute eye changes, neurologic signs)

If your cat has already been diagnosed with an adrenal tumor and seems suddenly worse, don’t wait for the next appointment—call a veterinarian immediately.

10. FAQ: common questions from cat owners

Is adrenocortical carcinoma the same as Cushing’s disease?

Not exactly. Cushing’s disease describes the effects of excess cortisol. Some adrenocortical carcinomas produce cortisol and cause Cushing’s signs, but others produce aldosterone or no excess hormones at all. Your veterinarian will use hormone testing and imaging to identify what’s going on.

Can an adrenal tumor cause high blood pressure and sudden blindness?

Yes. Aldosterone-producing tumors can contribute to high blood pressure, and severe hypertension can cause retinal detachment and sudden blindness. This is an emergency—prompt blood pressure control gives the best chance for recovery of vision, though it isn’t guaranteed.

How is an adrenal tumor different from kidney disease or diabetes?

They can look similar at first because increased thirst/urination and weight changes overlap. The difference is that adrenal tumors often create hormone-driven problems like low potassium, very high blood pressure, muscle weakness, fragile skin, or difficult-to-control diabetes. Testing helps sort this out, and some cats have more than one condition at the same time.

If surgery isn’t an option, is treatment still worthwhile?

Often, yes. Stabilizing potassium levels, controlling blood pressure, treating nausea, and managing infections can noticeably improve comfort and function. Your veterinarian can help you choose a plan based on your cat’s symptoms and your goals.

Will my cat need long-term monitoring?

Yes. Expect rechecks for blood pressure, electrolytes (especially potassium), kidney values, and repeat imaging as recommended. If surgery is done, follow-up is essential to detect recurrence or hormone shifts and to adjust medications safely.

What can I do today if I’m worried my cat has a hormone problem?

• Schedule a veterinary appointment and describe changes clearly (thirst, urination, weakness, coat/skin changes).
• Start a 7-day log of appetite, water intake, litter clump size/frequency, and any vomiting.
• Ask your veterinarian whether a blood pressure check and electrolyte panel (including potassium) are appropriate.

If you’re concerned your cat may have an adrenal tumor or any serious hormonal imbalance, professional veterinary evaluation is the safest next step. For more trustworthy, cat-owner-friendly health guides and tips, visit catloversbase.com for additional cat health resources.