Low-grade mucinous appendiceal neoplasm mimicking an ovarian lesion: A case report and review of literature

Figure 1  Low-grade mucinous appendiceal neoplasm presenting as a right adnexal mass (transvaginal ultrasound).

Figure 2  Low-grade mucinous appendiceal neoplasm assumed as an adnexal neoplasm: Results of the tumor assessment using the international ovarian tumor analysis ADNEX prediction model.

Figure 3 Low-grade mucinous appendiceal neoplasm mimicking an ovarian tumor (magnetic resonance imaging presentation). The blue arrow indicates the right ovary; the orange arrow indicates the tumor apparently originating from the right ovary.

Figure 4  Low-grade mucinous appendiceal neoplasm macroscopic features (appendectomy with tumorectomy specimen).

Figure 5 Appendectomy with tumorectomy specimens (histological characteristics). A: Proximal appendiceal stump with normal histological features [Hematoxylin & eosin (H&E) staining, 20 × magnitude]; B: Low-grade mucinous appendiceal neoplasm (LAMN) (H&E staining, 40 × magnitude, blue arrow showing acellular mucin); C: LAMN (H&E staining, 100 × magnitude, orange arrow absence of high-grade epithelial dysplasia).