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Appendiceal mucoceles represent abnormal accumulation of mucin in the appendix. They are rare and can be due to neoplastic and nonneoplastic causes, the most common cause being low-grade appendiceal mucinous neoplasm (LAMN), also known as mucinous cystadenoma of the appendix. We present the case of a 48-year-old woman who had complaints of abdominal pain for 2 months. Imaging showed mucocele of the appendix. She was taken for open appendectomy which revealed a huge (16.5 × 7 × 6 cm) mucocele, and histology proved it to be a LAMN with negative margins.