Management of Splenic Hydatid Cyst (Mrs. Amirtham, 68Y/F)

Step 1: Confirm the Diagnosis

• Serology - IgG ELISA and indirect hemagglutination assay (IHA) for Echinococcus granulosus. Note: false-negatives are more common with splenic cysts (versus hepatic), so a negative result does not exclude the diagnosis.
• Immunoblot assay / immunoelectrophoresis if ELISA is positive (to rule out cross-reaction with cysticercosis).
• CBC - look for eosinophilia (allergic sensitization).
• LFTs, renal function, coagulation - baseline pre-operatively.
• CT abdomen with contrast - already done (implied); confirm no biliary communication, assess vessel displacement, and characterize cyst stage.
• Chest X-ray / CT chest - rule out pulmonary hydatids (lungs are the second most common site).
• Echocardiogram - the radiology report notes an enlarged heart with atheromatous calcification; important for anaesthetic/surgical risk in this 68-year-old.

Step 2: Classify Cyst Stage (WHO-IWGE)

Step 3: Definitive Treatment

A. Medical (Antihelminthic) Therapy - Mandatory regardless of surgical approach

• Albendazole 400 mg twice daily (or 7.5 mg/kg twice daily, max 800 mg/day) in 28-day cycles with 14-day rest intervals.
• Start pre-operatively (ideally 4 weeks before surgery) to reduce cyst viability, reduce risk of intraoperative spillage, and prevent secondary seeding.
• Continue post-operatively for at least 3-6 months.
• Mebendazole is an alternative but has poor oral bioavailability and is considered inferior to albendazole.
• Monitor LFTs periodically (hepatotoxicity is the main side effect of albendazole).

B. Surgical Treatment - Primary recommendation for this patient

• Laparoscopic or open total splenectomy is preferred, depending on surgical expertise and patient fitness.
• Critical intraoperative precaution: avoid cyst spillage - spillage of cyst contents can cause:
  • Anaphylaxis and sudden death
  • Disseminated secondary echinococcosis (peritoneal seeding)
• The operative field should be packed with scolicidal-soaked (hypertonic saline 20% or 0.5% silver nitrate) swabs.
• If total splenectomy is technically difficult due to the cyst size and organ displacement, partial splenectomy with pericystectomy can be considered to preserve splenic tissue.

C. PAIR (Percutaneous Aspiration, Injection, Re-aspiration) - Not first choice here

• Are not surgical candidates (prohibitive comorbidities)
• Refuse surgery
• Need a bridging measure

Step 4: Peri-operative Measures

Step 5: Post-treatment Follow-up

• Repeat ultrasound or CT at 3, 6, and 12 months post-surgery.
• Continue albendazole for 3-6 months post-operatively.
• Recurrence after splenectomy is rare but monitor for peritoneal deposits.
• Serological titres can be followed: declining IgG titres indicate successful treatment.

Summary

Approach to Splenic Hydatid Cyst in the Indian Context

Why India is Different

• Rajasthan, Gujarat, Uttar Pradesh (Mrs. Amirtham's referring doctor is from Tamil Nadu, which also has endemic pockets, especially in sheep-farming districts)
• Andhra Pradesh, Karnataka, Punjab, Himachal Pradesh

What Actually Happens in Indian Tertiary Centres

1. Diagnosis Confirmation (same as anywhere)

• Echinococcus IgG ELISA - available at most major centres (AIIMS, CMC, PGIMER, NIMHANS)
• CECT abdomen already done (as in this case)
• Eosinophil count - a simple, cheap, and often overlooked pointer
• Chest X-ray to rule out pulmonary cysts (important before any anaesthesia)
• A positive ELISA + imaging findings = sufficient to proceed; biopsy is contraindicated (rupture risk)

2. Antihelminthic Coverage - Mandatory and Affordable

• Albendazole 400 mg twice daily is the drug of choice
• Available as Zentel / Noworm / Bendex across India, inexpensive (~₹30-60 per strip)
• Start 4 weeks pre-operatively, continue 3-6 months post-op
• Monitor LFTs monthly (drug is hepatotoxic at therapeutic doses)
• Albendazole alone is not curative for a 14.4 cm CE2 splenic cyst - it is adjunctive to surgery

3. Surgery - The Definitive Treatment in India

• Massive cyst size (14.4 cm) with significant organ displacement
• Cardiac enlargement and coronary artery calcification on the same report
• Risk of intraoperative cyst rupture is higher laparoscopically if not experienced

• Pack the field with hypertonic saline (20%) or betadine-soaked gauze before cyst manipulation
• Avoid spillage at all costs (anaphylaxis risk is real and documented)
• If rupture occurs: immediate IV hydrocortisone + chlorpheniramine + adrenaline ready

4. Pre-splenectomy Vaccinations - Often Missed in India

• Pneumococcal vaccine (Pneumovax 23 or PCV13)
• Meningococcal vaccine
• Hib (Haemophilus influenzae type b) vaccine

5. Post-Splenectomy Care in India

• Lifelong penicillin V (Phenoxymethylpenicillin 250 mg twice daily) or amoxicillin if penicillin allergy - to prevent overwhelming post-splenectomy infection (OPSI), which carries ~50% mortality
• Continue albendazole 3-6 months post-op
• Follow-up USG at 3, 6, 12 months to check for peritoneal recurrence
• Patient education: inform about OPSI risk - any fever in an asplenic patient is an emergency

6. What About PAIR in This Patient?

• This is a CE2 lesion (septated/multilocular) - PAIR works best for CE1 and CE3
• Size is 14.4 cm - too large for simple aspiration
• Spleen is technically harder to access percutaneously than the liver
• Spillage risk in the peritoneum from a splenic puncture is significant

Practical Pathway for This Patient in India

1. Admit → Albendazole 400mg BD started
2. Investigations: ELISA, CBC, LFTs, Echo, Cardiology consult
3. Pre-op vaccines (Pneumovax, MenACWY, Hib)
4. After 4 weeks albendazole + cardiac clearance:
   → Open / Laparoscopic total splenectomy
   → Scolicidal field precautions intraoperatively
5. Post-op: Albendazole x 3-6 months
           + Lifelong penicillin prophylaxis
           + USG follow-up at 3, 6, 12 months

Referral in Tamil Nadu

• CMC Vellore (extensive hydatid disease experience, excellent laparoscopic surgery unit)
• AIIMS Madurai or Stanley / Rajiv Gandhi Government Hospital, Chennai for public sector
• MIOT / Apollo Chennai for private sector laparoscopic splenectomy