10/07/2026
At Babies Hospital in New York, part of the assistant pathologist's job was to examine children who had died, to understand what had taken them.
In 1935, one of those children came with a diagnosis already written down: celiac disease, a digestive disorder.
The pathologist looked closely at the pancreas, the organ that helps the body digest food. It was scarred and damaged in a way that did not fit celiac disease.
Her name was Dorothy Hansine Andersen.
She could have recorded the finding and moved on. Instead, she started digging.
She had learned early on to carry heavy loads by herself.
She was born in Asheville, North Carolina, on May 15, 1901. Her father was Danish. He died when she was 13.
She and her mother moved to St. Johnsbury, Vermont. Her mother was an invalid, and Dorothy became her sole provider until her mother died in 1920.
She supported herself through St. Johnsbury Academy and Mount Holyoke College, then entered Johns Hopkins School of Medicine. She was one of only five women in her class.
She earned her medical degree in 1926.
She was 25.
What she wanted next was surgery. She completed a surgical internship at Strong Memorial Hospital in Rochester, New York, and taught anatomy at the University of Rochester.
Then she applied for a surgical residency at the same hospital. It had never given one to a woman, and it refused her too.
She changed course.
She moved to Columbia University in New York and turned to pathology, the study of disease in the body's tissues. She researched endocrine glands and earned a doctorate in medical science in 1935.
That same year, she became assistant pathologist at Babies Hospital. Her days there were spent at the autopsy table and the microscope.
So when that child's pancreas did not match the diagnosis, she had the training to notice.
She went back through the hospital's autopsy records and the medical literature, looking for other children with the same damage.
She found them.
Many of those children had been labeled with celiac disease or with ordinary lung infections. Their pancreases showed scarring and small fluid-filled cysts. Their lungs showed damage too.
The pattern was a disease of its own.
In 1938, she published her findings on 49 patients and gave the illness a name: cystic fibrosis of the pancreas.
The part usually left out is what she did next. Andersen did not see herself only as a pathologist who studied the dead. She was determined to diagnose the disease in living children, early enough to help them. With her research team at Babies Hospital, she worked on that problem for years, and their discoveries led to a straightforward diagnostic test for cystic fibrosis that is still used today.
She also noticed that the disease ran in families, and she pursued that question as well.
Her curiosity did not stop with cystic fibrosis. She was the first to describe a rare inherited disorder of how the body stores sugar. It came to be known as Andersen's disease.
She also became fascinated by heart defects in infants and built a large collection of hearts from babies born with them.
In the mid-1940s, the surgeons developing open-heart surgery came to her. They needed her knowledge and her specimens.
At Babies Hospital, doctors preparing to operate on children's hearts were required to complete her training course first.
The woman denied a surgical residency was now teaching surgeons.
In 1952, Babies Hospital named her chief of pathology.
Outside the hospital, she lived on her own terms. She called herself a rugged individualist. She did her own roofing and carpentry and was happy to make her own home repairs.
The American Academy of Pediatrics made her an honorary fellow. The national cystic fibrosis research foundation named her its honorary chair.
She died on March 3, 1963. She was 61.
Those 49 patients in her 1938 paper became the starting point for decades of research, including the discovery of the gene behind cystic fibrosis.
If you have ever refused to let a wrong answer stand because something did not add up, you already know what kept Dorothy Andersen at her microscope.
In 2002, she was inducted into the National Women's Hall of Fame. Today her portrait hangs once more at the hospital where she made her discovery, now NewYork-Presbyterian Morgan Stanley Children's Hospital.