Case Report

The Case of an Elderly Male Patient with Unknown Primary Mucinous Adenocarcinoma within Presacral Teratoma (Teratoma with Malignant Transformation)

Figure 2

(a) The lining of some cysts was composed of ciliated columnar. (b) There were papillary structures with hyalinized stroma and ciliated columnar epithelium. (c) In some areas, there was a multiloculated cystic appearance of the tumor, most of which were filled with mucinous matrix. (d) Inside the mucin pools, there were atypical and mitotically active cells, with increased nuclear/cytoplasmic ratio; (e) the MIB-1 staining was high in these cells which were considered as malignant.