Achilli, P.; Chiarelli, M.; Giustizieri, U.; Burati, M.; Tagliabue, F.; Maternini, M.; Terragn, S.; Guttadauro, A. Spontaneous Rupture of a Non-Functioning Pancreatic Neuroendocrine Tumor: A Case Report of a Rare Cause of Acute Abdomen. Ann Ital Chir 2020, 9, 1-5.