A. Case of a metastatic colorectal adenocarcinoma to ovary, comprising areas of necrosis (N) surrounded by tumor cells. Focal psammomatous calcification (arrow). H&E × 100. B. Higher magnification showing tumor cells displaying acinar arrangements with psammomatous calcification (arrows). H&E × 100. C. Diffuse CK 20 positivity. DAB × 400. D. Diffuse CEA expression. DAB × 200.
Rekhi et al. Diagnostic Pathology 2008 3:39 doi:10.1186/1746-1596-3-39