Pathology Lecture Review

"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."

Yesterday, I signed out her case. Let’s go back to the beginning." The slide changes. A diagram of a normal colon lining—orderly, like bricks in a wall.

She turns off the projector. The room is silent. pathology lecture

Now, Margaret’s tumor has a new skill: angiogenesis. It secretes VEGF, recruiting new blood vessels to feed its growth. The tumor doubles in size. It grows through the muscularis propria—the colon’s own muscle wall.

"Margaret’s primary tumor was 7 cm. It had invaded the omentum—that fatty apron of the abdomen. That’s what she felt as a lump. The omentum tried to wall it off, but the tumor just grew inside it like ivy on a fence." Part 4: The Diagnosis (The Biopsy) The slide changes to a histology image: disorganized glands, dark purple nuclei, mitotic figures. "But 'incurable' does not mean 'untreatable

She lets that word hang.

Setting: A darkened lecture hall, 8:00 AM. The smell of coffee and formaldehyde. Dr. Helena Voss, a pathologist in her 50s with steady hands and tired eyes, stands at a podium. On the screen behind her is a single slide: a biopsy stained pink and purple. Margaret was MSS—stable

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

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."