MUC5AC and adenocarcinoma: Given the low rate of incidence of mucin-secreting adenocarcinoma in the appendix, i.e., 0.12 cases per 1,000,000 people, with only about 0.2-0.3% of appendectomy specimens to be reported to have this diagnosis on histopathology, witnessing this case is rare and a golden opportunity to be a part of the process of its final diagnosis.