Appendiceal Signet Ring Cell Carcinoma: An Atypical Cause of Acute Appendicitis—A Case Study and Review of Current Knowledge oleh Branko Andjelkovic, Bojan Stojanovic, Milica Dimitrijevic Stojanovic, Bojan Milosevic, Aleksandar Cvetkovic, Marko Spasic, Stefan Jakovljevic, Danijela Cvetkovic, Bojana S. Stojanovic, Danijela Milosev, Minja Mitrovic, Vesna Stankovic