Biopsy – Definition, Types and Procedure
A biopsy is the targeted removal of tissue or cells from the body for microscopic examination. It is used to diagnose conditions such as cancer.
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A biopsy is the targeted removal of tissue or cells from the body for microscopic examination. It is used to diagnose conditions such as cancer.
What is a Biopsy?
A biopsy is a medical procedure in which a small sample of tissue, cells, or fluid is taken from the body and examined under a microscope in a laboratory. The goal is to detect abnormalities in the tissue, establish an accurate diagnosis, and guide the most appropriate treatment. Biopsies are among the most reliable diagnostic tools in modern medicine.
When is a Biopsy Performed?
A biopsy is recommended when imaging techniques such as ultrasound, X-ray, CT, or MRI reveal suspicious findings that require further investigation. Common indications include:
- Suspected benign or malignant tumors (e.g., breast cancer, skin cancer, colorectal cancer)
- Unexplained tissue changes or lumps
- Suspected inflammation or autoimmune conditions
- Monitoring organ transplants for signs of rejection
- Evaluation of liver or kidney diseases
Types of Biopsy
There are several types of biopsies, each used depending on the location of the tissue and the clinical question being investigated:
Core Needle Biopsy
A hollow needle is used to extract a small cylinder of tissue. This technique is commonly used for examining the breast, prostate, or liver.
Fine Needle Aspiration Biopsy (FNAB)
A thin needle is used to aspirate individual cells or clusters of cells. This minimally invasive method is frequently used for thyroid nodules or lymph nodes.
Incisional Biopsy
A portion of the suspicious tissue is surgically removed for analysis. This approach is used when a larger tissue sample is needed for diagnosis.
Excisional Biopsy
The entire suspicious tissue or tumor is surgically removed and analyzed. This method serves both a diagnostic and therapeutic purpose.
Endoscopic Biopsy
During an endoscopy (e.g., gastroscopy or colonoscopy), tissue is collected from the interior of hollow organs. This procedure is nearly painless and highly precise.
Liquid Biopsy
In a liquid biopsy, tumor cells or tumor DNA are analyzed from a blood sample. This minimally invasive method is gaining importance in cancer diagnostics and monitoring.
How is a Biopsy Performed?
The exact procedure depends on the type of biopsy. In general, the steps are:
- Informed consent discussion with the treating physician
- Local anesthesia of the affected area (for minor procedures) or general anesthesia (for surgical biopsies)
- Tissue sampling under ultrasound, CT, or MRI guidance
- Laboratory analysis of the sample by pathologists
- Results discussion within a few days to weeks
Risks and Side Effects
Biopsies are generally safe procedures. Possible but rare complications include:
- Bleeding at the sampling site
- Infection
- Pain or swelling
- In rare cases, injury to nearby structures
The risk is minimized through image-guided procedures such as ultrasound.
Results and Significance
The result of a biopsy provides essential information about the nature of the removed tissue. The pathology report can reveal whether the tissue is benign or malignant, which cell type is affected, and whether specific treatment is necessary. Based on this report, further therapy is planned.
References
- World Health Organization (WHO): Cancer Diagnosis and Pathology. Available at: https://www.who.int/cancer
- National Cancer Institute (NCI): Biopsy and Cytologic/Histologic Tests. Available at: https://www.cancer.gov/about-cancer/diagnosis-staging/diagnosis/biopsy-fact-sheet
- Kumar V, Abbas AK, Aster JC: Robbins & Cotran Pathologic Basis of Disease. 10th Edition. Elsevier, 2020.
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