Can Liposarcoma Be Seen on Ultrasound?

Reviewed on 4/21/2021

Liposarcoma is a cancer the develops in the body's connective tissues that look like fat cells. Liposarcoma can be seen on an ultrasound, which can be used to diagnose the cancer and determine what type it is.
Liposarcoma is a cancer the develops in the body's connective tissues that look like fat cells. Liposarcoma can be seen on an ultrasound, which can be used to diagnose the cancer and determine what type it is.

Liposarcoma is a rare type of cancer that develops in connective tissues that resemble fat cells. It can occur in almost any part of the body, but more than 50% of cases of liposarcoma form in the thigh, and up to one-third develop in the abdominal cavity. 

Liposarcoma can be seen on ultrasound. One of the diagnostic imaging tests used to diagnose liposarcoma includes ultrasound. In some cases, ultrasound can be used to help differentiate the type of liposarcoma based on the characteristics found on the sonogram

There are five types of liposarcoma:

  • Well-differentiated liposarcoma 
    • The most common subtype 
    • Usually starts as a low-grade tumor and tends to grow and change slowly
    • Often presents as a large painless mass found in deeper tissues and in the space behind the abdominal cavity (retroperitoneum)
  • Dedifferentiated liposarcoma
    • Occurs when a low-grade tumor changes, and the newer cells are high-grade
  • Myxoid liposarcoma
    • Intermediate to high-grade tumor
  • Round cell liposarcoma 
    • Can grow faster than well-differentiated tumors
    • Often found in the arms or legs
  • Pleomorphic liposarcoma 
    • The rarest subtype 
    • A high-grade tumor 
    • Has a high rate of recurrence and poor outcomes

What Are the Symptoms of Liposarcoma?

Liposarcoma may have no symptoms, especially early in the disease. When symptoms of liposarcoma occur, they may include: 

  • A lump 
    • May be soft or firm to the touch
    • Usually painless and slow growing
    • Swelling or numbness may occur in the area around the lump
  • If the tumor is in the abdomen:
    • Abdominal pain or cramping
    • Flank (side) pain
    • Abdominal swelling
    • Constipation 
    • Sensation of feeling full sooner than expected after eating
    • Blood in the stool (may appear as black or tarry stool)
    • Blood in vomit
  • Non-specific symptoms

What Causes Liposarcoma?

The cause of liposarcoma is unknown. 

Risk factors for developing liposarcoma include: 

  • Certain genetic syndromes
  • Exposure to radiation from treatment for another cancer
  • Exposure to some chemicals
  • Damaged lymph system

How Is Liposarcoma Diagnosed?

Liposarcoma is diagnosed with a physical examination. Tests used to help confirm the diagnosis include: 

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What Is the Treatment for Liposarcoma?

Treatment for liposarcoma depends on the type, size, and location of the tumor. Treatment for liposarcoma includes: 

  • Surgery
    • First-line treatment for primary liposarcomas that have not yet spread to other organs
    • The tumor is removed along with a wide margin of healthy surrounding tissue 
    • In about 5% of cases, limb amputation is needed to completely remove the cancer 
    • Complete surgical removal of tumors within the abdomen is difficult
  • Combination of surgery and radiation therapy
    • Radiation therapy may be used before, during, or after surgery to destroy tumor cells and reduce the chance of the tumor recurring in the same location
    • The combination of surgery and radiation therapy can prevent tumor recurrence at the surgical site in about 85-90% of cases
  • Chemotherapy
    • May be used in certain situations where patients have a high risk of recurrence or already have widespread disease
    • Erybulin mesylate (Halaven) targets a specific step in cell division that prevents cells from dividing and ultimately destroys tumor cells
    • Trabectedin (Yondelis) works similarly by interfering with the gene repair mechanism of tumor cells
  • Investigational therapies: immunotherapy drugs 
    • Checkpoint inhibitors work by blocking specific receptors on cells and releasing a natural brake on immune cells, so they can activate and target cancer-specific cells
      • Examples of checkpoint inhibitors include ipilimumab (Yervoy), nivolumab (Opdivo), and pembrolizumab (Keytruda)
    • T cell therapy involves removing normal T cells from the body and modifying them to recognize and attack cancer cells based on specific cell markers

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Reviewed on 4/21/2021
References
http://sarcomahelp.org/liposarcoma.html

https://rarediseases.org/rare-diseases/liposarcoma/

https://www.hopkinsmedicine.org/health/conditions-and-diseases/sarcoma/liposarcoma

https://pubmed.ncbi.nlm.nih.gov/31202456/