75 Letters, 5 Volumes, 700 Cases: Giovanni Battista Morgagni and the Birth of Pathological Anatomy

Today, not every medical student thinks of Morgagni when hearing the words "pathological anatomy," because his idea has penetrated medicine so deeply that it has become invisible. After examining a patient, asking "Does this person have a kidney mass, a liver lesion, or a lung nodule?" — that is, placing the symptom somewhere on the body's map — was not something that occurred to the physician before Morgagni. Within Galen's framework, the physician balanced the patient's fluids; an abnormality in a particular region of the body was a local reflection of that imbalance. After Morgagni, this logic was reversed: the location was now sought first. For the next two hundred and fifty years, medicine pursued ever-finer resolution in seeing where disease was located — first the organ, then the tissue, then the cell, then the molecule, and today the gene and the single-cell transcriptome. The first link in that chain lay on an Italian professor's desk in 1761.

Forlì, Bologna, Padua: Three Cities in an 89-Year Life

Morgagni was born on 25 February 1682 in Forlì, a small city in Romagna in northern Italy. He lost his father early and was raised by his mother. The young man did not initially turn to medicine: first he wrote poetry and devoted himself to the classics — Latin, Greek, and rhetoric. What drew him to medicine was the University of Bolognawith the most brilliant anatomical tradition in Italy at the time. He enrolled there at sixteen and found the most influential teacher of his life: Antonio Maria Valsalva (1666-1723) — the foundational discoverer of ear anatomy and the heart–lung function test known today in medicine as the "Valsalva maneuver." Valsalva taught his student two things: first, anatomy is not only something taught, but something done — if you do not touch the cadaver with your own hands, you cannot know it. Second, it is a mistake to think of the body's parts separately: each part is connected to another.

In 1701, at twenty, he received his medical degree from Bologna. Between 1706-1719, he published Adversaria Anatomica , a six-volume series of observations — each volume consisted of anatomical notes on one part of the body. These early works brought him fame throughout Europe; he became a member of the Royal Society (FRS) in 1724, the Académie des Sciences in 1735, and subsequently the academies of Berlin and Saint Petersburg . Central figures of the Enlightenment, such as Voltaire and Rousseau, wrote to him.

But Morgagni's real workplace from 1711 to 1771 — that is, a full sixty years — was the anatomy chair at the University of Padua. One of Europe's oldest medical faculties, Padua was where, in the 16th century, Vesalius wrote De humani corporis fabrica(1543); Morgagni grew within that tradition, then added his own layer to it. Vesalius had drawn the body's normal map. What Morgagni would create was the body's abnormal map — pathological anatomy.

Galen Was Still Dominant in 1761

In the years when Morgagni wrote De Sedibus, European medicine appeared on the surface to be modernizing. Surgery was advancing; surgeons such as Petit and Le Dran entered the body with a knife and removed local diseases. But medicine's conceptual framework — the answer to the question "What is disease?" — still came largely from Hippocrates and Galen. When examining a patient, the physician was looking not for a location but for an imbalance. Was there too much black bile, was phlegm dominant, was warmth lacking? Fever, sweat, urine color, and pulse were all ways of reading the proportions of these fluids.

Within this framework, the meaning of performing an autopsy was limited. When you opened the body after death, you found what you expected anyway: an accumulation of black bile, thickened phlegm, and tissue "washed in fluids." Vesalius had mapped the body, and Malpighi had brought the microscope into medicine in the 1660s (day 58), but this new anatomical knowledge had not yet fully transformed clinical practice. The physician saw the patient, examined their fluids, performed bloodletting, and induced vomiting. Autopsy remained little more than a demonstration in university lecture theaters.

What Morgagni would do was bring these two worlds — the bedside and the autopsy table — together permanently.

Seventy Letters, Five Volumes, Nearly Seven Hundred Cases

The title of the work looks cumbersome to a modern reader: De Sedibus et Causis Morborum per Anatomen Indagatis Libri Quinque. Latin. "Five books on the sites and causes of diseases investigated through anatomy." But its structure was elegant and new. Morgagni did not write this work like a conventional medical textbook; instead, he organized it as seventy letters written to a young scientist friend . Each letter addressed a particular anatomical region of the body: letters 1-14 covered the head and neck, letters 15-37 the chest and abdomen, letters 38-66 the lower abdomen, and letters 67-70 general surgical topics.

Within this structure, the method Morgagni used was the same for every case and established the basic template of modern medicine:

Today, this three-layer structure is the framework of every medical paper, every patient presentation, and every morbidity and mortality conference worldwide. It did not exist before Morgagni; after him, there was no other model. By applying this method consistently across nearly seven hundred cases, he gave clinical medicine a disciplined form.

Stomach, Pancreas, Breast, Liver — Among Seven Hundred Cases

De Sedibus contains seven hundred cases, approximately sixty to seventy of which were tumors later recognized as cancer. Morgagni used the term "cancer," but not in our modern sense—for him, cancer named a broad morphological spectrum extending from a "scirrhous tumor" (a hard mass with a fibrous consistency) to a "fungous tumor" (a soft mass growing like a mushroom). Because microscopy had not yet become established in pathology, tumor types were classified with the naked eye according to consistency and color. Something else mattered: Morgagni documented where these tumors were situated.

Reading them today, the most striking cases are these:

• Stomach cancer and intra-abdominal spread: Morgagni described in detail a scirrhous tumor in the pyloric region of the stomach wall and the secondary masses it produced in the liver, peritoneum, and omentum—even though the terms had not yet been coined, he grounded the concepts of peritoneal carcinomatosis and liver metastasis in clinical observation. Through direct observation, he demonstrated that symptoms such as vomiting, weight loss, abdominal pain, and jaundice arose from "a disease situated in the stomach and spreading from there."
• Pancreatic tumor ("pancreas scirrhosum"): The first systematic description of pancreatic cancer in medical history appears in De Sedibus. In autopsies of several patients who died with back pain and progressive jaundice, Morgagni recorded a hard, fibrous mass in the head of the pancreas and evidence of the pressure it exerted on the neighboring common bile duct. This description is identical to the classic clinical picture of pancreatic head adenocarcinoma today—back pain + obstructive jaundice + weight loss. The concept of pancreatic cancer entered medicine in 1761 through this case series.
• Breast cancer and axillary lymph node involvement: In autopsies of women with scirrhous breast tumors, Morgagni recorded hardened lymph nodes in the axillary region and emphasized that these nodes had "the same consistency and the same tissue character" as the primary tumor. This observation is directly the anatomical evidence for Le Dran's clinical theory, which we discussed yesterday: cancer begins in the breast and spreads through the lymph to the axilla. Le Dran said this at the surgeon's table in 1757; Morgagni demonstrated it at the pathologist's table in 1761. The two men did not know each other, yet four years apart they drew two halves of the same picture.
• Liver and biliary tract tumors: The separate descriptions of primary liver cancers and metastatic involvement of the liver in De Sedibus—in other words, Morgagni's recognition of the distinction between "the liver's own cancer" and "another cancer spreading to the liver"—show how far pathological thinking had advanced.
• Cervical cancer and bloody genital discharge: The first large series to demonstrate through autopsy that bloody vaginal discharge after menopause was caused by a tumor situated in the uterine cervix.

Reading these cases today, we notice this: Morgagni was not asking "What did he see under the microscope?" (pathology had not yet reached that stage). But he continually asked "in which organ, where did it start, where did it spread?" This is the very essence of modern oncology's anatomical way of thinking .

When Site (1761) and Spread (1757) Come Together

Here we reach an important historical crossroads in the series. In 1757, Le Dran published Mémoires sur le cancer, placing cancer within a theoretical framework based on clinical observation: cancer is local and spreads through the lymph. Four years later, in 1761, Morgagni's five-volume body of work on pathology supplied the anatomical foundation for this theory: every disease has a site, and that site can be demonstrated by autopsy. Without knowing each other, yet complementing each other, they established the two fundamental pillars of modern oncology:

These two men never even exchanged letters. Le Dran was in Paris and Morgagni in Padua—working in the same years on two different sides of the same problem. The collective intelligence of the 18th-century Enlightenment frequently produced such simultaneous discoveries. What mattered was that both men's ideas were nourished by the same intellectual atmosphere—a new confidence in observation, measurement, anatomy, and clinical reasoning.

From Organ to Cell, a Century of Zooming In

What Morgagni set in motion was a scientific chain whose magnification increased progressively over the following century. We will explore its links individually in the coming days of the series, but it is important to see the whole chain here:

When Morgagni asked the question of the "site of disease" in 1761, magnification was approximately 1×—the naked eye. Today, precision oncology's magnification is millions of times greater. But the question remains the same: where is the disease situated? The question was first asked in 1761, and the entire subsequent history of medicine consisted of seeking its answer at increasingly refined resolutions.

This article is Day 68 of the History of Cancer in 365 Days series. The subsequent links in the chain from the birth of pathological anatomy to modern cellular and molecular pathology—Bichat (Day 73), Müller (Day 81), Virchow (Day 87), Waldeyer (Day 90)—will be covered in the coming days of the series. The article takes a popular historical perspective; it does not provide medical treatment guidance.