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We recently encountered a 50-year-old male patient who was evaluated for extrahepatic biliary obstruction and was found to have a periampullary mass on imaging. The patient underwent pylorus-preserving pancreaticoduodenectomy along with liver biopsy and hepatoduodenal lymph node dissection. On histopathological examination, a tumor was detected in the periampullary region of duodenum, which was confirmed to be gangliocytic paraganglioma on immunohistochemistry along with atypical histological and immunohistochemical features.<\/jats:p>","DOI":"10.1177\/1066896915589969","type":"journal-article","created":{"date-parts":[[2015,6,16]],"date-time":"2015-06-16T21:01:09Z","timestamp":1434488469000},"page":"561-566","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Gangliocytic Paraganglioma With Atypical Immunohistochemical Features Presenting as Extrahepatic Biliary Obstruction"],"prefix":"10.1177","volume":"23","author":[{"given":"Saniya","family":"Sharma","sequence":"first","affiliation":[{"name":"Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Balan 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