KRT7 and carcinoid tumor: The malignant components consist of (1) well differentiated strumal carcinoid tumor confirmed with positive immunohistochemistry (IHC) for synaptophysin (Figure 1(b)), (2) well differentiated follicular variant of papillary thyroid carcinoma arising in struma ovarii tested positive for Thyroid Transcription Factor 1 (TTF1) (Figure 1(c)), Thyroglobulin and Cytokeratin 7 (CK7) by IHC, and (3) moderately differentiated mucinous adenocarcinoma arising in intestinal type mucinous cystadenoma (Figure 1(d)) which tested negative for CK7, negative for CDX2 and positive for CK20 by IHC.