1. Albores-Saavedra J, Henson DE, Klimstra DS (2000) Tumors of the gallbladder, extrahepatic bile ducts, and ampulla of Vater. N . Atlas of tumor pathology, Fascicle 27, third series. Armed Forces Institute of Pathology, Washington, DC
2. Altavilla G, Chiarelli S, Fassina A (2001) Duodenal periampullary gangliocytic paraganglioma: report of two cases with immunohistochemical and ultrastructural study. Ultrastruct Pathol 25:137–145
3. Amin SM, Albrechtsen NW, Forster J, Damjanov I (2013) Gangliocytic paraganglioma of duodenum metastatic to lymph nodes and liver and extending into the retropancreatic space. Pathologica 105:90–93
4. Anders KH, Glasgow BJ, Lewin KJ (1987) Gangliocytic paraganglioma associated with duodenal adenocarcinoma. Case report with immunohistochemical evaluation. Arch Pathol Lab Med 111:49–52
5. Archontovasilis F, Markogiannakis H, Dikoglou C, Drimousis P, Totouzas KG, Theodorou D, Katsaragakis S (2007) Paraganglioma of the greater omentum: case report and review of the literature. World J Surg Oncol 5:87