Hepatic lipidosis (fatty liver disease) is a syndrome characterized by an
accumulation of excessive amounts of lipid (fat) within the cells of the liver,
abnormal bile flow within the liver, and impaired liver function. Severe
impairment of liver function may affect the liver's ability to detoxify the
blood. As toxins accumulate, they can affect the mental status of the cat,
leading to mental dullness, severe depression, and seizures. Hepatic lipidosis
can occur as a primary event, or it can occur secondary to other disease
processes, such as diabetes. It is the most common liver disease encountered in
Adult cats of either sex can be affected. Any breed of cat is susceptible.
Middle aged to older cats are most likely to be affected.
Hepatic lipidosis can be a serious disease. Even with aggressive therapy, a
significant number of cats die from the condition.
The cause of hepatic lipidosis remains unknown. Obesity is thought to be a
predisposing factor, as most (but not all) affected cats are obese at the time
of disease onset. A period of anorexia (decreased appetite), occurring as a
result of a stressful event (such as the addition of a new pet or family member,
or a sudden change to a less palatable diet) can trigger the onset of hepatic
What To Watch For
Loss of muscle mass
Jaundice (yellow tint to the whites of the eyes and possibly the skin inside the
The diagnostic tests needed to confirm the presence of hepatic lipidosis and
exclude other liver disorders include:
Complete medical history and physical exam. This includes examination of the
gums, whites of the eyes, and other part of the body for jaundice (yellow
Blood tests and urine analysis to confirm that the liver is affected
Bile acid test to assess how well the liver is functioning
Abdominal x-rays to evaluate the liver
Abdominal ultrasound. This is a painless procedure in which a probe is held
against the abdomen and is used to detect valuable information about the health
of the liver.
Fine-needle aspirate of the liver. This technique allows for a small sample of
liver cells to be obtained and evaluated.
Liver biopsy. Obtaining a biopsy specimen (a small piece of the liver) is the
definitive test for making a diagnosis of hepatic lipidosis.
Dietary therapy is the mainstay of treatment. Affected cats may need to be force
fed, or fed through a tube in the nose, esophagus, or stomach. Hospitalization
is usually required for the first few days. Treatment for hepatic lipidosis may
also include some or all of the following:
Medication to control vomiting
Drugs that help control gastrointestinal bleeding for cats that develop stomach
Medications that help control the mental signs of hepatic lipidosis in severe
Blood transfusion if the impaired liver cannot normally regulate blood clotting
Drugs to improve bile flow within the liver
Home Care and Prevention
Follow all feeding instructions very carefully, as dietary therapy is the most
important aspect of therapy.
If a nasal, esophageal, or stomach feeding tube has been inserted, follow all
instructions as to the care and maintenance of this tube, and report any
problems to your veterinarian immediately.
Give all medications and dietary supplements as directed.
Although the actual cause of the disorder is unknown, obesity and anorexia have
been noted to be associated with the onset of disease. Therefore avoid
overfeeding your cat to prevent obesity and avoid stressful situations that may
cause a cat to suddenly stop eating, such as the addition of a new pet or family
member, or suddenly changing your cat's diet.
Section: Information In-depth
Hepatic lipidosis (fatty liver disease) is a common disease of the feline liver
in which abnormally large amounts of lipid (fat) accumulates within the cells of
the liver. In other animals (humans, dogs, laboratory animals), lipid
accumulation tends to be harmless, however, the cat's unique pathways of protein
and fat metabolism cause lipid accumulation in the liver to have severe
consequences. Any breed of cat may be affected, and both sexes seem to be
affected equally. Middle aged to older cats are more susceptible than young
Most, but not all, affected cats have a history of being obese, as well as a
history of a sudden loss of appetite, often precipitated by a stressful event,
such as a move to a new home, separation from an owner, a new pet or family
member in the household, or a sudden switch to an unpalatable food. Anorexia,
depression, and intermittent vomiting are the first signs usually noted by the
cat owner. As liver function worsens, cats may develop jaundice (a yellow
discoloration to the whites of the eyes, gums, and skin), severe loss of muscle
mass, drooling, and signs of mental dysfunction (severe depression, sudden
blindness, seizures). Cats often lose at least 25 percent of their body weight.
The diagnostic tests recommended will help differentiate hepatic lipidosis from
other liver diseases such as:
Cholangiohepatitis - an infection or inflammation of the liver and bile ducts
Feline infectious peritonitis - a deadly viral disease that can affect many
organs, including the liver
Toxic liver disease - caused by ingestion of a drug or other harmful toxin
Feline leukemia virus
Parasites - such as liver flukes (uncommon)
Section: Veterinary Care In-depth
Veterinary care should include diagnostic tests and subsequent treatment
There are a variety of diagnostic tests that may be run so that a diagnosis of
hepatic lipidosis can be made. These tests may include:
Medical history review and complete physical exam. A history of obesity and
sudden onset of anorexia after a stressful event is a classic finding in hepatic
lipidosis. Physical exam usually reveals dehydration, severe weight loss,
drooling and jaundice.
A complete blood count usually reveals mild anemia, and abnormally shaped red
blood cells (known as poikilocytes), which are often an indicator of liver
Blood tests that test organ function are especially important. Cats will usually
have moderate to severe elevations of several liver parameters. A thyroid test
is necessary to rule out a hyperactive thyroid as a cause of the liver enzyme
A bile acid test is a special blood test that may be necessary. It requires a
blood sample after a 12 hour fast. The cat is then fed (force fed, if
necessary), and another blood sample is taken two hours later. This simple test
assesses the function of the liver.
Analysis of the urine may give information concerning the function of the liver.
X-rays of the abdomen allows assessment of the size and shape of the liver, and
may help rule out a tumor as a cause of the liver problems.
Ultrasound of the abdomen allows limited assessment of the internal structure of
the liver. It allows some assessment of the gall bladder and biliary system, and
may rule out cancer as a cause of the liver disease. It may also help provide a
method for obtaining a biopsy sample.
A fine-needle aspirate of the liver is a small sample of liver cells that are
obtained by inserting a needle into the liver. This technique requires no or
minimal sedation, and complications are extremely rare. Results must be
interpreted cautiously, however, because concurrent liver diseases cannot be
ruled out and may be missed.
A liver biopsy, in which a small sample of liver tissue is obtained, is the
definitive test for diagnosing hepatic lipidosis. A biopsy specimen may be
obtained surgically, or may be obtained using a special instrument that is
inserted into the abdomen while being guided by the ultrasound probe. Surgical
biopsies can be obtained by most veterinarians. Ultrasound-guided biopsies are
often referral procedures.
Therapy for hepatic lipidosis is aimed at reversing the accumulation of fat in
the liver, and treating the signs of liver dysfunction. The primary treatment
for reversing the fat accumulation is aggressive nutritional support.
Dietary therapy is the mainstay of treatment. High protein diets are usually
recommended (except in cases where the cat is showing mental signs of liver
disease). Because nearly all affected cats are completely anorectic, food is
administered through a nasal, esophageal, or stomach tube. This requires
hospitalization, and sedation or anesthesia.
Several dietary supplements such as carnitine or arginine may be beneficial in
treating cats with hepatic lipidosis, and may be recommended or prescribed by
Vomiting is a frequent finding in cats with hepatic lipidosis. Many cats require
a medication to help control vomiting, such as metoclopramide, especially during
the initial 1 or 2 weeks of tube feeding.
Some cats with liver disease develop ulcers and subsequent gastrointestinal
bleeding. Drugs that control gastric acidity, such as Tagamet, Zantac or Pepcid,
may be necessary to help control this. Carafate, a gastric protectant, may be
used in conjunction with the antacids.
Antibiotics may be necessary in severe cases. They help kill off bacteria that
produce harmful toxins that may lead to various mental manifestations of liver
disease (drooling, depression, blindness, seizures).
Blood transfusions may be needed if the liver is so impaired that it cannot
produce adequate clotting factors or cannot regulate the ability of the blood to
Appetite stimulants (oxazepam, cyproheptadine) may be tried, but are seldom
useful. They seem to work best in the recovery phase of the disease.
Ursodeoxycholic acid, a drug that improves bile flow within the liver, may be
helpful in selected cases.
Optimal treatment for a cat with hepatic lipidosis requires a combination of
home and professional veterinary care. Follow up can be critical, especially if
your pet does not rapidly improve. With early detection and aggressive
nutritional support, survival rates for hepatic lipidosis are 60 to 80 percent.
Administer all prescribed medications as directed. Alert your veterinarian if
you are experiencing problems treating your pet.
Follow strict instructions concerning the care and management of any feeding
tube that has been placed in your cat.
Follow strict feeding instructions in terms of the type of food, amount of food,
and frequency of feeding, as dietary therapy is the most important aspect of
therapy. As the cat improves, tube feeding should be decreased, and palatable
food offered so as to encourage the cat to eat on his own. The tube is removed
when the cat is voluntarily eating enough to meet his energy requirements.
Your cat should be re-examined every 3 to 7 days to have body weight, hydration
status, and degree of jaundice evaluated.
A complete blood count, and a panel of blood tests evaluating the liver should
be performed every one to two weeks during treatment.