Giardia lamblia Infection in a Duodenal Duplication Cyst as a Potential Cause of Recurrent Acute Pancreatitis.

ABSTRACT

Giardia lamblia is a known etiological factor of a common infectious diarrhea. In rare cases, this parasite was found to be involved in the development of pancreatic and biliary tract diseases, both inflammatory and neoplastic. We present a case of a 64-year-old man known for a duodenal duplication cyst since 2013, with episodes of recurrent acute pancreatitis since 2017. He underwent endoscopic ultrasound-guided fine-needle aspiration of the duplication cyst, with evidence of G. lamblia infection. After treatment of giardiasis and evidence of parasite eradication, the episodes of recurrent acute pancreatitis ceased, following an ex adiuvantibus criterium.