What are Benign Soft Tissue Tumors?

What are Benign Soft Tissue Tumors?

Benign tumors of soft tissue are more common than benign tumors of bone. They can occur at almost any site, both within and between muscles, ligaments, nerves, and blood vessels. These tumors vary widely in appearance and behavior. Some tumors can be quite aggressive. Invasion of nearby tissues increases the chance of an incomplete excision and the possibility that the tumor will come back. Your surgeon may use specialized techniques and even radiation therapy to reduce the risk of recurrence.

Among the most common tumors which can be classified as benign soft tissue tumors are lipoma, angiolipoma, fibroma, benign fibrous histiocytoma, neurofibroma, schwannoma, neurilemmona, hemangioma, giant cell tumor of tendon sheath, and myxoma. Some conditions, like nodular fasciitis, are not tumors, but may require similar treatment. A small number of these tumors may be related to an underlying inherited condition.

The majority of the tumors in this category are benign tumors of fat called lipomas. Lipomas frequently occur just beneath the skin as a soft painless bulge which grows slowly over a period of months to years. These tumors represent very little risk to the patient and can be adequately treated by a "marginal excision" which is commonly described as "shelling out the tumor." This type of treatment has a high rate of success. However, not all of these lumps need to be removed. Your physician may determine that the lipoma needs only to be observed. Some of these lipomas are deep below the fascia or with the muscle group. Care needs to be taken to distinguish these deep "lipomas" from cancers and lower grade cancers.

In settings where the tumor is not a benign lipoma, the strategy of "shelling out the tumor" can spread a tumor, which might otherwise be easily treated by a more careful surgical procedure. Malignant tumors that are discovered unexpectedly can often be spread in this way.

Therefore, if the lump does not feel like a lipoma, if it is seen to grow, or causes pain, it should be assessed carefully and thoughtfully. Often the use of MRI scans can assist in determining both the location and the internal characteristics of the tumor.

A soft tissue mass, which does not have the appearance of a lipoma on MRI, needs to be approached more cautiously. Often, a minimally invasive biopsy is desirable, prior to commitment to any larger surgical procedure. The vast majority of benign soft tissue tumors can be treated with a single clean surgical procedure and minimal risk to surrounding normal blood vessels, nerves, muscle or bone. This provides the patient with the greatest possible functional recovery and the least chance of local recurrence of the tumor. In general, the orthopaedic surgeon should consider a biopsy before proceeding with an excision of a tumor. Only on rare occasions should the orthopaedic surgeon consider resection without a biopsy.

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