Pathology: Lecture

The professor collects her papers.

"But 'incurable' does not mean 'untreatable.' We have chemotherapy—FOLFOX or FOLFIRI. We have bevacizumab to block VEGF, stop the angiogenesis. We have immunotherapy if she’s MSI-high. Margaret was MSS—stable. So no magic bullet. But we could buy her time. Good time. Time to see her grandson’s first birthday." Part 5: The Final Chapter (The Autopsy) The last slide is a quote from William Osler: "Medicine is a science of uncertainty and an art of probability."

The pathologist (me) signed it out: 'Moderately differentiated adenocarcinoma of the colon, with lymphovascular invasion, metastatic to liver.' pathology lecture

She died peacefully, at home, with morphine for air hunger and lorazepam for terminal agitation.

She pauses.

"This is the moment it becomes malignant. Carcinoma in situ becomes invasive adenocarcinoma. The cells learn to secrete matrix metalloproteinases—molecular scissors. They cut through the collagen. They reach the submucosa. And inside the submucosa are lymphatics and blood vessels.

The autopsy—which I performed—showed a 4 cm liver metastasis that had replaced 60% of her liver parenchyma. The primary colon tumor had perforated silently, walled off by the omentum. And here’s what matters: we found two tiny metastases in her lungs, each 2 mm. Too small to see on CT. That’s why she didn’t respond fully to chemo—the disease was always one step ahead." The professor collects her papers

"This is Margaret’s biopsy. See the glands? They’re 'back-to-back'—no normal stroma between them. See the nuclei? They’re hyperchromatic, elongated, stratified. And here—a mitotic figure. That cell is in the middle of dividing wrong.