Knee Tumors: From Benign Growths to Painful Symptoms

Tumor on the knee?

When I was a child, I developed a benign tumor on one side of my knee.
At that time, I was too young to remember the name of the tumor.
The doctor suggested wearing a brace to see if it could be compressed back, but that didn't work, so I underwent surgery for removal.
A few months after the surgery, the tumor grew back, although it was smaller than the first time.
During a follow-up visit, the doctor said there was no cause for concern and recommended monitoring it.
After a few follow-up visits, I stopped regular check-ups.
The tumor remained but did not grow larger.
Later, when I entered middle school, the tumor disappeared.
I didn't have any follow-up appointments; I could feel it because the first tumor was about 4 to 5 centimeters wide, so I could easily detect it.
After the tumor disappeared, I didn't pay much attention to it.
Now that I am in high school, the tumor has returned, but this time it feels a bit different.
It is painful, and its shape is harder to discern.
Previously, it was visibly noticeable, but now it is not apparent from the outside.
When I stand straight on that leg, I feel something (likely the tumor) pinching my bone, which causes some discomfort.
I've been feeling this pain for about six months, and it also hurts after bending for a long time.
Is it possible that this could be a malignant tumor? I have researched a lot online and really don't know of any benign tumors that would keep recurring in the same location, like an osteochondroma?

lei, 10~19 year old female. Ask Date: 2020/08/15

Dr. Hu Ziren reply Oncology

It is recommended to follow up with an orthopedic specialist.

Reply Date: 2020/08/15

More Info

Understanding knee tumors, particularly benign growths, is crucial for managing symptoms and determining the appropriate treatment. Based on your description, it appears that you have experienced a recurring benign tumor in your knee, which has now returned with additional symptoms such as pain and discomfort.

Types of Knee Tumors
The most common benign tumors that can occur in the knee region include osteochondromas, chondromas, and osteoblastomas. Osteochondromas are often found in children and adolescents and can cause discomfort or pain, especially if they impinge on surrounding structures. Chondromas and osteoblastomas are less common but can also lead to similar symptoms.

Symptoms and Concerns
The fact that your tumor has returned and is now causing pain is concerning. While benign tumors are typically not cancerous, they can still lead to significant discomfort and complications. The pain you are experiencing, especially if it has been persistent for over six months, warrants further investigation. The change in the tumor's characteristics—becoming less palpable and more painful—could indicate a change in its behavior, which is something that should be evaluated by a healthcare professional.

Potential for Malignancy
While the likelihood of a benign tumor transforming into a malignant one is low, it is not impossible. Certain benign tumors, such as osteosarcomas, can occur in the same area and may present with similar symptoms. Therefore, it is essential to have a thorough evaluation, including imaging studies like X-rays or MRIs, to assess the tumor's current state and rule out any malignant changes.

Recommended Actions
1. Consult an Orthopedic Specialist: Given your history and the current symptoms, it is advisable to consult an orthopedic surgeon who specializes in tumors. They can perform a physical examination and recommend imaging studies to evaluate the tumor's size, location, and characteristics.

2. Imaging Studies: An MRI or CT scan can provide detailed information about the tumor and surrounding tissues, helping to determine if it is benign or if there are any concerning features that require further investigation.

3. Monitoring: If the tumor is confirmed to be benign but symptomatic, your doctor may recommend a watchful waiting approach, especially if it is not causing significant functional impairment. However, if the pain persists or worsens, surgical intervention may be necessary.

4. Pain Management: In the meantime, managing your pain with over-the-counter anti-inflammatory medications, such as ibuprofen, may help alleviate discomfort. However, this should be done under the guidance of a healthcare professional.

5. Physical Therapy: Engaging in physical therapy may also help strengthen the muscles around the knee, potentially reducing pain and improving function.

Conclusion
In summary, while your history of a benign tumor in the knee is significant, the current symptoms you are experiencing warrant further evaluation to ensure that there are no malignant changes. It is crucial to seek medical advice from an orthopedic specialist who can provide a comprehensive assessment and guide you through the appropriate management options. Regular follow-ups and monitoring are essential to ensure that any changes in the tumor's behavior are addressed promptly.

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