[Medical Human Story – Episode 70] The Shadow of Death That Even AI Missed: The Final Truth of a Primary Pulmonary Artery Sarcoma Misdiagnosed as Pulmonary Embolism-2

 

 "It was never a blood clot. It was a silent tumor, feeding on the remaining time of a man’s life."

Part II: The Temperature of Solitude That Machines Could Not Read

 

The hospital was submerged in pitch-black darkness. It was 5:00 AM, a time when all life on earth swims in the deepest sea of sleep, dreaming of tomorrow’s sunlight. But the emergency room and intensive care unit were exceptions. They were fierce borderlines where life and death stood face-to-face, separated by a thin membrane—a waiting room between heaven and hell where the groans of the suffering never ceased. Kim Jung-ho lay precariously on that cold boundary.

On the surface, treatment seemed to be working. As the anticoagulants were administered, his oxygen saturation slowly climbed, and his heart rate, which had been racing past 120, appeared to stabilize. Yet, Professor Seo Yoon-ah of the Radiology Department could not shake the chill running down her spine. A doctor is a profession that learns through experience that the comfort numbers provide can sometimes be the cruelest of lies. Is the patient really recovering, or are they sinking deeper into the abyss while pretending to heal? Reading complex, unpredictable human variables within the cold framework of science was always a lonely and isolated struggle for Seo.

[Medical Insight: Diagnostic Value of Contrast-Enhanced Imaging]

Memories Trapped in Cold Metallic Sounds. 

At 8:00 AM, Mr. Kim was transferred to the MRI suite. The dull, thumping noise of the massive magnet—clunk, clunk—sounded like the giant pendulum of a clock ticking away his remaining time. Trapped inside the narrow, suffocating tunnel of the magnet, Mr. Kim breathed in the frigid air and closed his eyes.

In the darkness, the bright smile from his wedding day 38 years ago flickered to life. The vow he had made—"I will make you happy for the rest of our lives"—was still vivid, yet he was now facing the encroaching shadow of death. 'Not yet,' he clung desperately to the future. The face of the grandchild soon to be born, his wife’s tears, and the future of the daughter who would stand by his side. The more reasons he found to live, the more the fear of death tightened its grip on his heart.

Thousands of images were transmitted to the server, and Seo held her breath, staring at the monitor. The moment she opened the files, her heart plummeted. In the T2-weighted images, the tumor glowed with a bright, vibrant signal that no blood clot could ever possess. The eerie signs of cells multiplying madly, devouring life itself. It was, without a doubt, a "living tumor."

[Medical Insight: Limitations of AI Algorithms and Data Bias]


Decisions Beyond Statistics. 

At 1:00 PM, an emergency multidisciplinary meeting was convened with experts from across the hospital. The MRI images on the screen were clear, but the air in the conference room was frozen with tension.

"It is a primary pulmonary artery sarcoma," Seo declared firmly. A cardiologist challenged her: "Professor, statistically, there is a 99% chance it is a pulmonary embolism. Isn't it too big a gamble to overturn the treatment plan for a single rare case?"

Seo did not back down; she silently scrolled through the images. The cross-section of the contrast-enhanced tumor shows the traces of cancer cells breaching the vessel walls and protruding outward. Just then, the head of the AI development team spoke cautiously: "Based on our learning data, 99% of similar patterns are pulmonary embolisms. Our algorithm continues to support that diagnosis."

"Thirteen cases," Seo’s cool voice filled the room. "The number of PPAS cases the AI has learned from global data is only thirteen. We are currently diagnosing a disease we have seen only 13 times. Medicine is not a majority vote, and the patient is not a statistical figure. This person is not a number; he is a single, precious human being."

"What if your judgment is wrong, Professor?"

Seo replied without wavering: "I will take full responsibility. But if I am right... We can save this one life."

Defying common sense and overturning the majority opinion, the history of medicine has always been written by the courage of one person willing to challenge the impossible.

Under the Cold Fluorescent Lights of the counseling room

At 4:00 PM, the family was finally called into the counseling room. The air, illuminated by cold fluorescent lights, felt heavy. Seo carefully but firmly introduced the word "cancer."

'Cancer.' The ripple effect of that one word was colossal. Even before a formal confirmation, to the family, that word already signaled the collapse of their lives. His wife, Su-jin, slumped to the floor and wailed, facing the reality that she might lose the companion she had walked with for 38 years. Grief is contagious, and the room was filled with lamentation.

That night, standing on the hospital rooftop facing the cold night wind, Seo looked down at the countless lights of the city. Perhaps AI could provide a perfect diagnosis, but could it understand the terror of losing a loved one? Could it calculate the desperate, agonizing loneliness a human feels in the face of death?

Probably never. That is the realm of the human doctor—a domain that machines can never imitate. Tomorrow’s PET-CT scan would be the decisive evidence that would seal Kim Jung-ho’s fate. The city lights continued to twinkle indifferently, but inside the hospital, the most fervent battle to protect human dignity had begun.

 

This is a web novel adapted from the blog “https://leesangbock.blogspot.com/2026/06/primary-pulmonary-artery-sarcoma-vs-pulmonary-embolism-imaging-ai.html”.

 To be continued. "Part III: The Last Confession Spilled by the Truth"

https://medicalhumanstory.blogspot.com/2026/06/medical-human-story-primary-pulmonary-artery-sarcoma-ai-diagnosis_01848014726.html

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