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Soft Tissue Biopsy – Definition, Procedure and Significance

A soft tissue biopsy is a procedure in which a small sample of muscle, fat, tendon, or connective tissue is removed and examined to diagnose tumors, inflammation, or other conditions.

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Things worth knowing about "Soft Tissue Biopsy"

A soft tissue biopsy is a procedure in which a small sample of muscle, fat, tendon, or connective tissue is removed and examined to diagnose tumors, inflammation, or other conditions.

What Is a Soft Tissue Biopsy?

A soft tissue biopsy is a medical procedure in which a small sample of soft tissue is removed from the body and sent to a laboratory for examination. Soft tissue includes muscles, fat, tendons, ligaments, blood vessels, nerves, and connective tissue. The biopsy is used to determine the exact nature of a tissue abnormality – for example, whether it is a tumor, an inflammatory process, or another condition.

When Is a Soft Tissue Biopsy Performed?

A soft tissue biopsy is typically ordered when imaging techniques such as ultrasound, magnetic resonance imaging (MRI), or computed tomography (CT) reveal an abnormality in the soft tissue. Common indications include:

Suspected benign or malignant soft tissue tumor (e.g., lipoma, fibroma, sarcoma)
Unexplained swelling or a palpable lump in the tissue
Suspected inflammatory conditions affecting muscles or connective tissue (e.g., myositis)
Investigation of metastases of unknown origin
Monitoring response to cancer therapy

How Is a Soft Tissue Biopsy Performed?

There are several techniques for performing a soft tissue biopsy, selected based on the location, size, and nature of the tissue abnormality:

Core Needle Biopsy

In a core needle biopsy, a hollow needle is inserted into the tissue under local anesthesia to extract a small cylinder of tissue. This procedure is often performed under ultrasound or CT guidance to ensure accuracy. It is minimally invasive and typically leaves only a small scar.

Fine Needle Aspiration Biopsy (FNAB)

A fine needle aspiration biopsy uses a very thin needle to aspirate individual cells from the abnormal area. The procedure is quick and gentle but provides only individual cells rather than intact tissue architecture, which limits its diagnostic detail compared to a core needle biopsy.

Incisional Biopsy

An incisional biopsy involves surgically removing a portion of the abnormal tissue. This open procedure is used when a larger tissue sample is needed for diagnosis or when the location of the lesion makes a needle biopsy difficult.

Excisional Biopsy

In an excisional biopsy, the entire suspicious structure is surgically removed and then examined. This technique serves as both a diagnostic and therapeutic measure, particularly for smaller benign tumors.

Preparation and Procedure

Most soft tissue biopsies are performed on an outpatient basis under local anesthesia. For deep-seated lesions or in pediatric patients, sedation or general anesthesia may be required. Before the procedure, the physician will explain the risks, alternatives, and planned approach. Blood-thinning medications may need to be paused in advance.

Risks and Side Effects

A soft tissue biopsy is generally a safe procedure. Possible complications include:

Bleeding or bruising at the biopsy site
Infection
Temporary pain or swelling
Very rarely: injury to adjacent nerves or blood vessels
With malignant tumors: a theoretical risk of spreading tumor cells along the needle track, which is minimized through careful planning

Analysis and Results

The tissue sample is examined under a microscope by a pathologist. This allows identification of the cell type and origin, detection of signs of inflammation, and – in the case of tumors – determination of whether the growth is benign or malignant, along with the precise tumor subtype. Results are typically available within a few days to two weeks and form the basis for further treatment planning.

Importance for Diagnosis and Treatment

Soft tissue biopsy is an indispensable diagnostic tool in orthopedics, oncology, rheumatology, and surgery. It provides precise diagnostic information that imaging alone cannot offer and is critical for selecting the appropriate treatment – whether surgery, radiation therapy, chemotherapy, or a conservative approach.

References

Kransdorf MJ, Murphey MD. Imaging of Soft Tissue Tumors. 3rd edition. Lippincott Williams & Wilkins, 2013.
Soft Tissue and Bone Sarcoma Group, European Society for Medical Oncology (ESMO): Clinical Practice Guidelines for Soft Tissue and Visceral Sarcomas. Annals of Oncology, 2021.
World Health Organization (WHO): Classification of Tumours of Soft Tissue and Bone. 5th edition. IARC Press, Lyon, 2020.

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