Bland glands resembling endometrial glands, which were regarded as endometriosis, focally existed; Case 3 showed tubular nests of usual EMA (Figure 3e), cribriform-like nests simulating Call-Exner bodies (Figure 3f), and condensed stroma intervening among the solid nests; Case 4 showed tubular nests and small-sized nests or strands (Figure 3h), benign counterparts of adenofibromatous endometrioid tumor (Figure 3i) and mucinous cystadenoma (Figure 3j). Here, MUC1 is linked to endometriosis.