FIG 2. Histology of a hemorrhagic spinal subdural metastasis in a 59-year-old woman.

A, Photomicrograph shows numerous small anaplastic epithelial cells with nuclear polymorphism (red arrows). These malignant cells are also present within the blood vessels (yellow arrows) (Mallory, original magnification x400).

B, Photomicrograph demonstrates strong carcinoembryonic antigen (CEA) reactivity in metastatic carcinoma cells (Immunohistochemistry for CEA, original magnification x400).