A 62-year-old man from rural Maharashtra presents with a 3-month history of progressive painless jaundice, pale stools, and dark urine. He has lost 8 kg over this period. On examination, he is icteric with a palpable gallbladder. Abdominal ultrasound shows dilated intrahepatic and extrahepatic bile ducts with a hypoechoic lesion in the pancreatic head. CA 19-9 is markedly elevated at 480 U/mL. CT abdomen with contrast reveals a 3.5 cm mass in the pancreatic head with involvement of the superior mesenteric vein. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis and Staging Strategy **Key Point:** Tissue diagnosis is mandatory before any definitive treatment in suspected pancreatic cancer, even when imaging is highly suggestive. ### Why EUS-FNA is the Correct Next Step This patient has classic pancreatic head cancer presentation: - Painless jaundice (Courvoisier sign: palpable gallbladder) - Weight loss and constitutional symptoms - Elevated CA 19-9 - Imaging findings consistent with pancreatic head mass However, **tissue confirmation is non-negotiable** before committing to major surgery or palliative care. EUS-FNA offers: 1. High sensitivity (85–95%) and specificity for pancreatic masses 2. Simultaneous assessment of vascular involvement 3. Lower morbidity than percutaneous biopsy 4. Can be performed in the same endoscopy session **High-Yield:** After tissue diagnosis, staging laparoscopy is performed to detect occult peritoneal/liver surface metastases that would preclude resection (found in 10–15% of cases deemed resectable on imaging). ### Assessment of Resectability Although the mass shows SMV involvement, this does NOT automatically make it unresectable. Resectability requires: - No distant metastases - No involvement of celiac axis or superior mesenteric artery - Adequate performance status **Clinical Pearl:** SMV involvement alone is NOT a contraindication to resection; en bloc vascular resection and reconstruction can be performed in selected cases. ### Why Other Options Are Premature | Option | Why Incorrect | |--------|---------------| | Immediate Whipple's | No tissue diagnosis yet; SMV involvement requires careful assessment; staging laparoscopy not done | | Palliative stent alone | Assumes unresectability without tissue diagnosis or staging laparoscopy | | PTCS as definitive | Addresses jaundice but does not treat cancer; is a temporizing measure only |