[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-3

 


 

Part III: The Last Confession Spilled by the Truth

 

The next morning, long rays of cold winter sunlight stretched across the hospital hallway. Yet, inside Room 602, the air was crushed by a heavy silence that no warmth from the outside world could reach. Kim Jung-ho hadn't slept a wink. While the medical team was still carefully wrapping the truth in phrases like "further tests are needed," human intuition is sharper than any cutting-edge diagnostic device. In the fleeting moments when the doctors' eyes wavered, in the awkward silence as they over-explained, he had already sensed that the "Grim Reaper" was quietly growing inside him.

[Medical Insight: Principles of PET-CT and Metabolic Features of Cancer]

 

The Flame of Death Burning in the Images.

At 9:00 AM, Mr. Kim lay once again before the giant cylindrical PET-CT scanner. The machine's noise ceased, and the generated image data was transmitted to Professor Seo’s monitor. The moment the screen opened, she involuntarily held her breath.

Inside the cold pipe of the pulmonary artery, a giant flame was burning vividly. It possessed a vitality that a blood clot could never have—an aggressive, stark FDG uptake. The nuclear medicine professor’s short sigh turned into conviction: "It’s over." That single phrase was like a death sentence. At the same time, under the pathologist's microscope, the cruel truth emerged through the slides: "It is a very high-grade sarcoma. Primary pulmonary artery sarcoma (PPAS) is confirmed."

At 2:00 PM, on the large screen in the multidisciplinary conference room, two sentences floated in parallel: AI's [Pulmonary Embolism 97.8%] and Pathology's [Confirmed Pulmonary Artery Sarcoma]. The room was engulfed in such silence that one could not even hear a breath. More than the fact that the AI was wrong, the reality that humans had blindly trusted the "AI’s calculations" and pushed the patient into that trap weighed heavily on everyone’s chest. Seo felt no sense of victory. Medicine often reveals the truth to save a patient, but when that truth is too cruel, a doctor finally realizes the extent of their own human helplessness.

[Medical Insight: Risks of Primary Pulmonary Artery Sarcoma (PPAS)]


The Counseling Room, at the End of a Crumbling World.

In the counseling room, a space where the ticking of the clock sounded abnormally loud, Mr. Kim and his family sat facing the medical team. With a trembling voice, Seo calmly delivered the truth: "It is not a pulmonary embolism. It is cancer. It is a primary pulmonary artery sarcoma."

The screams of the family filled the room. His wife, Su-jin, closed her eyes, and his son, Min-su, clenched his fists until his knuckles turned white. Kim Jung-ho, however, was surprisingly calm. He asked the question that every human asks at the final moment, but which doctors dread the most:

"How much time do I have left?" "On average... about one year to a year and a half."

Jung-ho did not cry. It was as if his brain had severed the circuits of emotion to protect itself. He quietly walked out of the counseling room and sat on a cold winter bench in the hospital garden. Only when he was alone did he finally pour out the most fragile, human tears. The despair of not being able to hold his grandchild, the sorrow of not being able to attend his daughter’s wedding—the primal desire to live scattered into tears.

Confession: The Moment 38 Years of Silence Was Broken

That evening, returning to the ward, Jung-ho looked at his family and spoke words they never expected: "I’m sorry. There is something I have hidden my whole life."

Su-jin and the children held their breath. Because a man facing death has no reason to lie, his words carried immense weight. The regrets and secrets stacked up over 38 long years—this was not a mere individual mistake, but a confession massive enough to reshape the lives of the entire family. As Jung-ho opened his mouth, the air inside the room shifted.

Seo overheard the conversation from outside the ward door. A question remained in her heart that would never be washed away: Why is it that humans only reveal their oldest secrets when standing on the threshold of death? And are the moments we fail to say "I love you" to our loved ones while we live only proven in their value when we reach the very end? Jung-ho’s confession began, and in the face of the weight of that truth, time inside the hospital came to a complete standstill.

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 IV: The Will to Survive, Born from a Machine’s Wrong Answer"

https://medicalhumanstory.blogspot.com/2026/06/medical-human-story-primary-pulmonary-artery-sarcoma-ai-diagnosis_01603808591.html

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