Microwave ablation (MWA) is a cutting-edge, minimally invasive interventional radiology procedure that uses microwave energy to generate intense heat within targeted tumors, destroying cancer cells without surgery. As one of the most advanced tumor ablation technologies available, microwave ablation offers patients — particularly those with liver tumors, lung tumors, kidney tumors, and thyroid nodules — a highly effective treatment option with significantly lower risk, shorter hospital stay, and faster recovery than conventional surgery. At Edge Imaging and Diagnostics, Raghubir Nagar, West Delhi, our interventional radiology team performs microwave ablation using state-of-the-art systems under real-time ultrasound or CT guidance, serving patients from Rajouri Garden, Tagore Garden, Punjabi Bagh, Paschim Vihar, Moti Nagar, Kirti Nagar, and Janakpuri.

What Is Microwave Ablation? How Does It Work?

Microwave ablation (MWA) works by delivering focused microwave electromagnetic energy (typically at 915 MHz or 2.45 GHz frequencies) through a thin probe (antenna) placed directly into the tumor. The microwave energy causes water molecules in the tumor tissue to vibrate at extremely high speeds, generating friction and intense heat — reaching temperatures of 60–150°C within the ablation zone. At temperatures above 60°C, tumor cells undergo irreversible coagulative necrosis (cell death), creating a precisely controlled ablation zone that destroys the tumor while minimizing damage to surrounding healthy tissue.

Compared to its predecessor technology — radiofrequency ablation (RFA) — microwave ablation offers several clinical advantages: larger ablation zones, faster ablation times, higher intratumoral temperatures, better performance in tumors adjacent to blood vessels (which can act as a “heat sink” cooling the ablation zone in RFA), and consistent performance in both dry and wet tissue types. According to evidence reviewed on PubMed/NCBI, MWA demonstrates local tumor control rates of 85–95% for appropriately selected liver tumors up to 5 cm.

Microwave Ablation vs. Radiofrequency Ablation (RFA) — Key Differences

Feature	Microwave Ablation (MWA)	Radiofrequency Ablation (RFA)
Energy type	Microwave electromagnetic energy	Radiofrequency electrical current
Maximum temperature	Up to 150°C	100–105°C (limited by tissue carbonization)
Ablation zone size	Larger (up to 5–6 cm in a single application)	Smaller per application (2–4 cm)
Ablation speed	Faster (3–10 minutes per tumor)	Slower (10–30 minutes per tumor)
Heat sink effect	Significantly less affected by blood vessels	Significantly affected — vessels cool the ablation zone
Multiple antennas	Can use multiple simultaneously for larger tumors	Possible but less common
Best for	Larger tumors, perivascular tumors, lung tumors, thyroid	Smaller tumors in accessible locations
Grounding pads	Not required (no electrical circuit)	Required (large skin grounding pads needed)

What Conditions Are Treated with Microwave Ablation?

Liver Tumors — Hepatocellular Carcinoma (HCC) and Metastases

The liver is the most common target for microwave ablation in oncological practice. MWA is indicated for:

Hepatocellular carcinoma (HCC): In patients with HCC tumors ≤5 cm who are not surgical candidates (due to poor liver function, Child-Pugh B/C cirrhosis, multifocal disease, or patient refusal of surgery). MWA achieves complete ablation in over 90% of HCC tumors ≤3 cm, with 5-year survival rates comparable to surgical resection in carefully selected patients
Colorectal liver metastases: Patients with limited liver metastases from colorectal cancer who are unresectable or who have refused surgery. MWA combined with systemic chemotherapy significantly improves progression-free survival
Liver metastases from other primary cancers (neuroendocrine tumors, breast cancer, renal cell carcinoma)
Recurrent liver tumors after prior surgical resection or ablation

Lung Tumors

Microwave ablation of lung tumors is an effective treatment for early-stage non-small cell lung cancer (NSCLC) in patients who cannot tolerate surgery — particularly elderly patients, those with severe COPD, or patients with compromised pulmonary function where lobectomy would be fatal. MWA can also treat limited pulmonary metastases (from colorectal, renal, or sarcoma primaries). CT-guided lung MWA is performed at Edge Imaging and Diagnostics with immediate post-procedure CT to confirm adequate ablation and check for pneumothorax.

Kidney Tumors (Renal Cell Carcinoma)

For small renal cell carcinoma (RCC) tumors ≤3–4 cm in patients who are poor surgical candidates (elderly patients, those with solitary kidney, hereditary RCC syndromes with multiple tumors, or bilateral tumors), microwave ablation provides excellent local tumor control with nephron-sparing results. CT or ultrasound-guided renal MWA at our Delhi center is performed under conscious sedation or general anaesthesia.

Thyroid Nodules

Microwave ablation of thyroid nodules is an emerging, minimally invasive alternative to thyroid surgery for:

Benign symptomatic thyroid nodules: Large colloid or adenomatous nodules causing compressive symptoms (dysphagia, hoarseness, neck discomfort) or cosmetic concerns — MWA causes progressive nodule shrinkage (typically 50–80% volume reduction over 6–12 months) without hypothyroidism
Autonomously functioning thyroid nodules (toxic adenoma): Causing hyperthyroidism — MWA normalizes thyroid function with high success rates and no radiation
Low-risk papillary thyroid microcarcinoma: In carefully selected patients who are not candidates for or refuse surgery — MWA with ultrasound guidance achieves local control in the majority of cases

Adrenal Tumors

CT-guided microwave ablation of adrenal metastases (from lung, colorectal, or renal primary cancers) and selected primary adrenal tumors is performed at our Delhi center. For pheochromocytoma, careful pre-procedural alpha-blockade is essential to prevent hypertensive crisis during ablation.

Bone Tumors (Osteoid Osteoma and Metastatic Bone Disease)

CT-guided microwave ablation is highly effective for osteoid osteoma — a benign painful bone tumor — providing complete pain relief in over 95% of patients in a single session. For metastatic bone disease, MWA provides effective local tumor control and significant pain palliation.

Who Is a Candidate for Microwave Ablation?

Microwave ablation is not suitable for every patient. Careful patient selection is critical for optimal outcomes. General criteria for MWA candidacy include:

Liver MWA: Liver tumor(s) ≤5 cm (ideally ≤3 cm for best results), no more than 3 tumors in most cases (some centers treat up to 5), adequate liver function (Child-Pugh A or B), tumor not touching the main bile duct or major hepatic veins
Lung MWA: Peripheral lung tumor ≤3 cm, no central airway involvement, adequate contralateral lung function
Renal MWA: Renal tumor ≤4 cm, tumor not in the central collecting system
Thyroid MWA: Benign or low-risk nodule confirmed by prior FNAC, adequate technical access
General requirements: Correctable coagulopathy (INR ≤1.5, platelets ≥50,000), no active infection, no complete biliary obstruction, ability to undergo the procedure under sedation or general anaesthesia

How Microwave Ablation Is Performed at Edge Imaging and Diagnostics, Raghubir Nagar

Step 1: Pre-Procedure Tumour Board Assessment

All microwave ablation cases at our Delhi center are reviewed in a multidisciplinary tumor board discussion with interventional radiologists, oncologists, and relevant surgical specialists. This ensures that MWA is the optimal treatment for each patient’s specific tumor type, size, location, and overall clinical status.

Step 2: Pre-Procedure Preparation

Blood tests (CBC, coagulation profile PT-INR, LFT, KFT), cross-sectional imaging (contrast CT or MRI) within 4 weeks for pre-procedure planning, IV access, fasting (4–6 hours), and antibiotics (for liver ablation) are all arranged before the procedure date.

Step 3: Imaging-Guided Antenna Placement

Under real-time ultrasound or CT guidance (depending on the organ and tumor location), the microwave antenna is advanced percutaneously through the skin and tissues into the center of the target tumor. Precise placement in the tumor center is critical — the antenna must be positioned such that the resulting ablation zone covers the entire tumor with an adequate safety margin (typically 5–10 mm of surrounding normal tissue).

Step 4: Microwave Energy Delivery

Once the antenna is confirmed in the correct position, microwave energy is delivered at the pre-calculated power (typically 45–100 Watts) for the predetermined time (3–10 minutes for liver tumors). Real-time ultrasound monitoring shows progressive “echobright” (hyperechoic) change in the ablation zone, indicating coagulative necrosis. The antenna can be repositioned or additional antennas placed for larger tumors to ensure complete ablation.

Step 5: Post-Ablation Imaging Confirmation

Immediately after ablation, contrast-enhanced CT or contrast ultrasound (CEUS) is performed to confirm the ablation zone covers the entire tumor with adequate margins. The critical finding sought is complete absence of enhancement within and around the treated tumor — confirming successful necrosis with no residual viable tumor. Any residual enhancement (residual viable tumor) can be immediately re-treated in the same session.

Preparing for Microwave Ablation in Delhi

Fasting: Nothing by mouth for 6 hours before the procedure (4 hours for clear fluids)
Blood tests: CBC, PT-INR (must be ≤1.5), aPTT, platelet count, LFT, KFT within 2 weeks
Stop blood thinners: Warfarin stopped 5–7 days before; aspirin and clopidogrel stopped 5 days before; NOACs stopped 24–48 hours before (specific instructions provided at consultation)
IV access: Peripheral IV line for anaesthetic agents and emergency medications
Imaging: Bring latest contrast CT or MRI showing the tumor to be treated
Admission: Most liver and lung MWA patients require 24–48 hours of hospital observation post-procedure

Risks and Complications of Microwave Ablation

Post-ablation syndrome: Low-grade fever, fatigue, and right upper quadrant discomfort for 1–5 days after liver ablation — managed with paracetamol and NSAIDs
Bleeding: Rare (<2%) — the coaxial antenna tract is typically sealed during removal to prevent hemorrhage
Pneumothorax: ~20–25% for lung MWA — majority are minor and self-resolving
Thermal injury to adjacent structures: Bile duct stricture, bowel injury, diaphragmatic injury — very rare with careful planning and technique
Infection/abscess formation: Rare (<1%) — prophylactic antibiotics are given for liver ablation
Local recurrence: Occurs in 5–15% over 2–3 years — regular follow-up imaging is essential

Post-Microwave Ablation Follow-up Protocol

After microwave ablation at Edge Imaging and Diagnostics, a structured follow-up program is essential to detect local recurrence early:

1 month post-ablation: Contrast CT or MRI to confirm complete ablation and establish baseline post-ablation appearance
3 months: Repeat contrast imaging — any new enhancement at the ablation margin is concerning for local recurrence
6, 12, 18, 24 months: Ongoing surveillance imaging
Tumour markers: AFP (for HCC), CEA/CA19-9 (for colorectal metastases) at each follow-up visit

Suggested Images

Image 1 Alt Text: “Microwave ablation of liver tumor being performed under ultrasound guidance at Edge Imaging Delhi”
Image 2 Alt Text: “Microwave ablation antenna positioned in HCC liver tumor CT guidance Raghubir Nagar Delhi”
Image 3 Alt Text: “Post microwave ablation CT showing complete ablation zone liver tumor Delhi”
Image 4 Alt Text: “Microwave ablation center near Punjabi Bagh Rajouri Garden West Delhi”

Frequently Asked Questions — Microwave Ablation in Delhi

Q1. Is microwave ablation better than surgery for liver cancer?

For carefully selected patients with small HCC (≤3 cm), multiple studies show that microwave ablation achieves local tumor control rates and 3–5 year survival rates comparable to surgical resection. MWA offers the significant advantages of no surgical incision, no general surgical risk, preserved liver function (important in cirrhotic patients), shorter hospital stay (1–3 days vs. 5–10 days for surgery), and faster return to normal activities. For larger tumors (>5 cm) or tumors requiring major vascular reconstruction, surgical resection remains preferable.

Q2. How many sessions of microwave ablation are needed?

Most small tumors (≤3 cm) are completely ablated in a single session. Larger tumors may require a planned second ablation session, or the immediate repositioning of the antenna within the same session for multi-overlapping ablations. Local recurrence identified on follow-up imaging can often be re-treated with a repeat ablation session. Each case at our Raghubir Nagar center is individually planned to achieve complete ablation in the minimum number of sessions.

Q3. Is microwave ablation painful?

The procedure is performed under conscious sedation (IV midazolam + fentanyl/propofol) with local anaesthesia, or under general anaesthesia for complex cases. During the procedure, most patients experience minimal discomfort. Afterward, the most common complaint is post-ablation syndrome — flu-like symptoms, low-grade fever, and mild right upper quadrant ache lasting 1–5 days. This is managed effectively with oral paracetamol and NSAIDs at home.

Q4. What is the cost of microwave ablation in Delhi?

Microwave ablation costs in Delhi vary by organ, tumor size, number of sessions, and whether CT or ultrasound guidance is used. At Edge Imaging and Diagnostics, Raghubir Nagar, liver MWA typically ranges from ₹50,000–₹1,20,000 per session (including procedure, imaging guidance, consumables, and hospital observation). Thyroid nodule MWA ranges from ₹30,000–₹60,000. Please contact us for a detailed, individualized cost estimate based on your specific case. Most medical insurance policies cover tumor ablation procedures with appropriate medical documentation.

Q5. Can microwave ablation cure liver cancer?

For early-stage HCC (single tumor ≤5 cm, or up to 3 tumors ≤3 cm each — “Milan Criteria”), microwave ablation can achieve complete local tumor destruction with curative intent. Long-term outcomes data show 5-year survival rates of 40–70% after MWA for early HCC — comparable to surgical resection in many studies. However, cirrhotic patients remain at risk for developing new HCC in the remaining liver, necessitating ongoing surveillance. “Cure” in this context means complete local tumor control, not prevention of new tumor development.

Book a Microwave Ablation Consultation at Edge Imaging and Diagnostics, Delhi

If you or a family member has been diagnosed with a liver, lung, kidney, or thyroid tumor and are seeking a minimally invasive, highly effective treatment alternative to surgery, microwave ablation at Edge Imaging and Diagnostics, Raghubir Nagar may be the right answer. Our expert interventional radiology team will review your case, perform a thorough patient selection assessment, and provide a personalized treatment plan.

We serve patients from Rajouri Garden, Tagore Garden, Punjabi Bagh, Paschim Vihar, Moti Nagar, Kirti Nagar, Janakpuri, and across Delhi NCR.

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Microwave Ablation in Delhi: Tumor Treatment, Procedure, Cost & Recovery Guide