Lymph Node Biopsy Image Guided Precision Diagnosis

Why is Lymph Node Biopsy Important?

Lymph nodes are small, bean-shaped structures distributed throughout the body as part of the lymphatic and immune system. When lymph nodes enlarge (lymphadenopathy), it is often a sign of a reactive process (infection, inflammation) or a pathological process (cancer, lymphoma). To determine the exact cause, a tissue biopsy is required. Accurate diagnosis is essential because the treatment for lymphoma is completely different from the treatment for metastatic carcinoma, which is different again from tuberculosis — conditions that can all cause identical lymph node enlargement on imaging.

• Distinguishes lymphoma from metastatic cancer from infection
• Essential for staging and treatment planning
• Avoids unnecessary empirical treatment
• Can sample deep nodes inaccessible to palpation
• Image guidance ensures accurate sampling with minimal risk

CT-Guided vs. Ultrasound-Guided Biopsy

The choice of guidance modality depends on the location and characteristics of the target lymph node. Ultrasound-guided biopsy is ideal for superficial and easily visible lymph nodes in the neck, axilla, groin, or superficial abdomen. It offers real-time guidance, is radiation-free, and is well-tolerated. CT-guided biopsy is used for deep, retro-peritoneal, mediastinal, pelvic, or retrocrural lymph nodes that cannot be adequately visualised on ultrasound. CT provides precise three-dimensional localisation of the target node and clear delineation of adjacent critical structures (vessels, nerves, bowel) that must be avoided during the needle path planning.

How the Procedure is Performed

The procedure is performed under local anaesthesia. The patient is positioned on the CT or ultrasound table. The target lymph node is identified on imaging and a safe needle trajectory is planned, avoiding major vessels and other critical structures. The skin is cleaned, sterile drapes are applied, and local anaesthetic is injected. A fine-needle (for FNAC) or core biopsy needle is advanced into the lymph node under continuous imaging guidance. Multiple core biopsy samples (typically 3–5) are taken to ensure adequate tissue for histopathological analysis, immunohistochemistry, flow cytometry, and molecular testing. The procedure takes approximately 20–30 minutes.

• Performed under local anaesthesia no general anaesthesia
• Small needle puncture no surgical incision
• Multiple cores obtained for comprehensive analysis
• Tissue sent for histology, IHC, flow cytometry, and cultures
• Patients can go home within 2–3 hours of the procedure
• Minimal bleeding risk with modern coaxial biopsy technique

What Can Be Diagnosed?

Lymph node biopsy provides material that can diagnose a wide range of conditions. For haematological malignancies, biopsy can confirm Hodgkin lymphoma or non-Hodgkin lymphoma and provide subtype information essential for treatment planning. For solid tumours, biopsy can confirm nodal metastasis and often identify the primary tumour through immunohistochemistry markers. Granulomatous conditions such as tuberculosis (TB) and sarcoidosis can be confirmed on histology and culture. Reactive lymphadenopathy from viral infections can be distinguished from malignancy. In many cases, the biopsy result directs treatment and avoids more extensive surgical procedures.

Safety and Complications

Image-guided lymph node biopsy is a very safe procedure in experienced hands. The risk of serious complications is less than 1%. Minor bleeding at the biopsy site is the most common minor complication, which is self-limiting. Infection is rare given the use of sterile technique. Pneumothorax is a rare complication when biopsying mediastinal or chest nodes, but is minimised with careful CT-guided needle placement. At Sparsh Hospitals, Dr. Shetty reviews each case carefully before the procedure, planning the optimal approach to minimise risk and ensure adequate tissue sampling. Patients are observed for 2–3 hours post-procedure before discharge.