Liposarcoma

Liposarcoma is a rare type of cancer that starts in fat cells, which are found throughout your body. It is a form of soft tissue sarcoma. This cancer can develop anywhere, but it most commonly appears in the arms, legs, or inside the abdomen. Early detection and treatment are important for a better outlook.

What is Liposarcoma?

Liposarcoma is a rare cancer that begins in the body's fat cells, making it a type of soft tissue sarcoma. These tumors can form in any part of the body where fat cells are present, but they are most often found in the limbs, such as the arms and legs, or deep within the abdomen.

Liposarcoma is one of the more common types of soft tissue sarcoma, but it is still considered rare overall. It develops when fat cells grow abnormally and form a tumor. These tumors can vary greatly in how they behave, from slow-growing to very aggressive (Mayo Clinic, MedlinePlus). There are several different types of liposarcoma. The most common type is called well-differentiated liposarcoma, which usually grows slowly. Other types include myxoid liposarcoma, pleomorphic liposarcoma, and dedifferentiated liposarcoma. Each type has unique characteristics that affect how it is treated and its potential outcome (MedlinePlus). The location of the tumor can also impact symptoms and treatment. Tumors in the limbs are often easier to detect, while those deep inside the abdomen may grow quite large before they cause noticeable problems (Mayo Clinic).

Symptoms

Liposarcoma often does not cause any noticeable symptoms in its early stages. As the tumor grows, you might notice a new lump or swelling. Symptoms can vary depending on where the tumor is located, such as pain or weakness in a limb, or abdominal discomfort if it's in your belly.

When liposarcoma develops in an arm or leg, you might notice a growing lump or mass under the skin. This lump may or may not be painful. Other symptoms in the limbs can include swelling, a feeling of fullness, or weakness in the affected area (Mayo Clinic, MedlinePlus). If the tumor is located deep inside your abdomen, it can grow quite large before you experience any symptoms. When symptoms do appear, they might include abdominal pain, swelling, or a feeling of being full after eating only a small amount. Some people may also experience constipation or, rarely, blood in their stool (MedlinePlus). It is important to remember that many lumps and swellings are not cancer. However, any new or growing lump should be checked by a doctor to determine its cause (Mayo Clinic).

Causes & risk factors

The exact cause of liposarcoma is not fully understood, and it is not typically inherited. However, certain factors can increase your risk. These include previous radiation therapy for other cancers, exposure to specific chemicals, and some rare inherited genetic conditions.

Scientists do not know the precise reasons why fat cells sometimes become cancerous and form a liposarcoma. It is generally not considered an inherited condition that runs in families. Most cases appear to happen by chance without a clear cause (Mayo Clinic, MedlinePlus). However, certain risk factors have been identified. People who have received radiation therapy for other types of cancer in the past may have a slightly increased risk of developing a liposarcoma in the treated area. Exposure to certain industrial chemicals has also been linked to an increased risk (MedlinePlus). Rarely, liposarcoma can be associated with certain inherited genetic syndromes. These include conditions like Li-Fraumeni syndrome, Gardner syndrome, and neurofibromatosis type 1. A damaged lymph system, such as from severe lymphedema, is another potential risk factor (Mayo Clinic, MedlinePlus).

How it's diagnosed

Diagnosing liposarcoma typically begins with a physical exam to check for lumps or swelling. Imaging tests, such as MRI or CT scans, are then used to visualize the tumor's size and location. A biopsy, which involves taking a tissue sample for examination, is essential to confirm the diagnosis and determine the specific type of cancer.

If you have a suspicious lump or symptoms, your doctor will first perform a physical exam. They will feel the area to check the size, texture, and depth of any mass. This initial step helps guide further diagnostic tests (Mayo Clinic). Imaging tests are crucial for seeing the tumor inside your body. Common imaging methods include magnetic resonance imaging (MRI), computed tomography (CT) scans, and sometimes ultrasound or positron emission tomography (PET) scans. These images help doctors understand the tumor's exact location, size, and whether it has spread to nearby tissues or organs (MedlinePlus). The only way to definitively diagnose liposarcoma and determine its specific type is through a biopsy. During a biopsy, a small sample of tissue is removed from the tumor. This sample is then examined under a microscope by a pathologist, who can identify cancer cells and classify the type of liposarcoma (Mayo Clinic). The biopsy might be a needle biopsy, where a thin needle removes tissue, or a surgical biopsy, where a larger piece is removed (MedlinePlus).

Treatment options

Treatment for liposarcoma usually involves a combination of approaches tailored to the tumor's type, size, and location. Surgery is the primary treatment to remove the tumor. Radiation therapy and chemotherapy may also be used, often before or after surgery, to help shrink the tumor or kill remaining cancer cells.

Surgery is the main treatment for most liposarcomas. The goal is to remove the entire tumor along with a margin of healthy tissue around it to ensure all cancer cells are gone. The extent of surgery depends on the tumor's size and location. For tumors in the limbs, this might involve removing muscle or other tissues (Mayo Clinic, Cochrane Library). Radiation therapy uses high-energy beams to kill cancer cells. It may be used before surgery to shrink a large tumor, making it easier to remove. It can also be used after surgery to destroy any cancer cells that might have been left behind, reducing the chance of the cancer coming back (MedlinePlus, Cochrane Library). Chemotherapy uses drugs to kill cancer cells throughout the body. It is less commonly used for liposarcoma compared to surgery or radiation, but it may be an option for more advanced or aggressive types of liposarcoma, or if the cancer has spread to other parts of the body. Targeted drug therapy, which focuses on specific weaknesses in cancer cells, may also be used for certain types, such as myxoid liposarcoma (Mayo Clinic, MedlinePlus). Treatment plans are often developed by a team of specialists, including surgeons, radiation oncologists, and medical oncologists. This multidisciplinary approach helps ensure the best possible care for each individual (Cochrane Library).

Recovery & outlook

The recovery and outlook for liposarcoma vary widely, depending on factors like the tumor's type, size, location, and whether it has spread. Early diagnosis and complete surgical removal generally lead to a better prognosis. Regular follow-up care is crucial, as liposarcoma can sometimes recur, even years after successful treatment.

After treatment, recovery involves healing from surgery and managing any side effects from radiation or chemotherapy. Physical therapy may be needed, especially if the tumor was in a limb, to help regain strength and movement. Your medical team will provide specific guidance for your recovery process (Mayo Clinic). The outlook for people with liposarcoma depends on several factors. These include the specific type of liposarcoma (some are more aggressive than others), the tumor's size and location, how much it has spread (if at all), and whether the entire tumor could be removed during surgery. Generally, smaller tumors that are completely removed have a better prognosis (MedlinePlus). Liposarcoma can sometimes come back (recur) even after successful treatment, either in the same area or in other parts of the body. Because of this, regular follow-up appointments, including physical exams and imaging tests, are very important. Your doctor will monitor you closely to detect any recurrence early (Mayo Clinic). While liposarcoma is a serious condition, advancements in treatment have improved outcomes for many people. It's important to discuss your specific prognosis and treatment plan thoroughly with your healthcare team, as they can provide the most accurate information based on your individual situation (MedlinePlus).

When to see a doctor

You should see a doctor if you notice any new or growing lump anywhere on your body, especially if it is deep, firm, or painful. While most lumps are not cancerous, it is important to have any suspicious mass evaluated promptly to determine its cause and ensure early diagnosis if it is liposarcoma.

It is always wise to consult your doctor about any new lump or swelling that appears on your body. Pay particular attention if the lump is growing in size, feels firm, is located deep under the skin, or causes you pain or discomfort (Mayo Clinic, MedlinePlus). If you experience any unexplained abdominal pain, swelling, a feeling of fullness, or changes in bowel habits like new constipation, especially if these symptoms persist, you should also seek medical advice. These could be signs of an abdominal liposarcoma (MedlinePlus). Early detection of liposarcoma can significantly improve treatment outcomes. Do not delay seeking medical attention for any concerning symptoms. Your doctor can perform an examination and recommend appropriate tests to investigate the cause of your symptoms (Mayo Clinic).

Frequently asked questions

Is liposarcoma a common type of cancer?

No, liposarcoma is considered a rare type of cancer. It is one of the more common forms of soft tissue sarcoma, but soft tissue sarcomas themselves are uncommon overall.

Can liposarcoma spread to other parts of the body?

Yes, liposarcoma can spread, or metastasize, to other parts of the body, especially more aggressive types. The risk of spread depends on the specific type of liposarcoma, its size, and its grade.

Is liposarcoma inherited?

In most cases, liposarcoma is not inherited and does not run in families. However, a very small number of cases are linked to rare inherited genetic syndromes, such as Li-Fraumeni syndrome.

What is the difference between a lipoma and a liposarcoma?

A lipoma is a common, non-cancerous (benign) growth of fatty tissue that is usually soft and movable. A liposarcoma, on the other hand, is a rare, cancerous (malignant) tumor that also starts in fat cells but can grow aggressively and spread. A biopsy is needed to tell them apart.

How long does it take for liposarcoma to grow?

The growth rate of liposarcoma varies significantly depending on its type. Some types, like well-differentiated liposarcoma, can grow very slowly over many years. More aggressive types, such as pleomorphic or dedifferentiated liposarcoma, can grow much more quickly.

Can liposarcoma be cured?

A cure for liposarcoma is often possible, especially when the cancer is diagnosed early and can be completely removed with surgery. However, there is a risk of recurrence, so long-term follow-up care is essential. The outlook depends on many factors, including the tumor's type and stage.

Sources

• MedlinePlus — Liposarcoma
• Mayo Clinic — Liposarcoma
• Cochrane Library — Liposarcoma