A desmoid tumor is a rare, noncancerous growth that forms in connective tissue—the framework that supports muscles, ligaments, and organs. While these tumors can appear anywhere in the body, they most commonly develop in the arms, legs, or abdomen. They are also known as deep fibromatosis, aggressive fibromatosis, or desmoid fibromatosis.
Unlike cancerous tumors, desmoid tumors do not spread to other parts of the body. Many grow slowly and cause minimal issues, but some can expand rapidly and put pressure on surrounding tissue, nerves, or organs. Treatment is available, but desmoid tumors have a tendency to return after removal.
Types of Desmoid Tumors
Doctors classify desmoid tumors based on their location in the body:
- Abdominal Wall Desmoid Tumors: These grow in the tissue surrounding abdominal organs, such as the stomach.
- Intra-Abdominal Desmoid Tumors: These form in the mesentery, the tissue that encases the intestines.
- Extra-Abdominal Desmoid Tumors: These appear outside the abdomen and are often found in the shoulders, upper arms, chest wall, and upper legs. In some cases, they may also develop in the head or neck.
Symptoms and Causes
Desmoid tumors don’t always cause symptoms, but when they do, they can lead to pain, soreness, or tingling if they press against nerves or blood vessels. A noticeable lump or swelling may appear, often in the arms, legs, or abdomen, sometimes making it difficult to move the affected limb. Tumors in the abdomen can also cause nausea and vomiting if they put pressure on internal organs. While not every lump is a cause for concern, it’s best to see a doctor if you notice one that’s larger than two inches, keeps growing, or becomes painful.
What Causes Desmoid Tumors?
Desmoid tumors form when connective tissue cells undergo genetic mutations and multiply uncontrollably, though the exact cause remains unclear. However, certain factors can increase the risk, including high estrogen levels, which have been linked to tumor development, and a higher prevalence in women, particularly during pregnancy when estrogen levels rise, and the abdominal wall stretches. Additionally, individuals with familial adenomatous polyposis (FAP) have a 10% chance of developing desmoid tumors. Trauma or repeated injury to a specific area may also trigger tumor growth.
Diagnosis and Testing
To diagnose a desmoid tumor, a doctor will start with a physical examination and discuss any symptoms you’re experiencing. Additional tests may include:
- CT Scan: Provides a detailed image of the tumor’s location.
- MRI Scan: Helps determine the tumor’s size and relationship to surrounding tissue.
- Biopsy: A sample of the tumor is examined under a microscope to confirm the diagnosis.
Desmoid Tumor – Treatment Options
Doctors often approach desmoid tumor treatment similarly to cancer treatment, tailoring care based on tumor size, location, and symptoms. The most common treatment is surgery, but other options may be used:
- Active Surveillance: If a tumor isn’t causing symptoms, doctors may monitor it over time instead of intervening immediately.
- Targeted Therapy: Medications like tyrosine kinase inhibitors (TKIs) can block signals that promote tumor growth.
- Cryoablation: This technique freezes and destroys tumor cells, often used when surgery isn’t viable.
- Chemotherapy: In some cases, oral or intravenous chemotherapy helps shrink or eliminate tumors.
- Hormone Therapy: Medications like tamoxifen can help slow tumor growth.
Potential Side Effects
Side effects depend on the type of treatment received. Common effects may include fatigue (especially after chemotherapy or surgery) or an increased risk of infection following surgery. Your doctor will discuss these risks before starting treatment.
Surgical Recovery
Recovery from desmoid tumor surgery usually takes about two to three weeks, though this varies by individual. Your surgeon will provide guidance on post-surgical care and what to expect during recovery.
Prevention and Prognosis
Can Desmoid Tumors Be Prevented?
Because desmoid tumors arise from genetic mutations, there is no known way to prevent them. However, if you have risk factors like FAP or a history of desmoid tumors, regular medical checkups can help with early detection.
Survival Rates and Long-Term Outlook
Desmoid tumors are rarely life-threatening, but they can be difficult to treat due to their tendency to return. According to the American Society of Clinical Oncology (ASCO), more than 98% of people diagnosed with desmoid tumors survive at least five years after diagnosis.
Can They Be Cured?
For some patients, surgery successfully removes the tumor, effectively curing the condition. However, in cases where the tumor cannot be fully removed, additional treatments may be necessary to manage growth and symptoms.
Desmoid tumors can recur even after treatment, so regular monitoring is essential. If you notice a new lump or bump, especially one larger than two inches, that continues to grow or becomes painful, consult a healthcare provider for evaluation.
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Resource: Cleveland Clinic
