Abstract
Appendiceal signet ring cell carcinoma is an exceedingly rare neoplasm which makes up only 4% of carcinomas of the appendix. It is a rare cause of abdominal pain which can mimic acute appendicitis. This case reports a 77-year-old female who presented to the emergency room with a complaint of right lower quadrant abdominal pain. After exploratory laparoscopy and histopathological studies, the patient was found to have peritoneal carcinomatosis and appendiceal signet ring cell carcinoma. This diagnosis unfortunately carries a relatively poor prognosis due to its aggressive nature. This study discusses the etiology, prevalence, clinical findings, and treatment of a rare cause of abdominal pain. This report sheds light on the importance of early detection and treatment of appendiceal signet ring cell carcinoma.