Experts have suggested that he was seemingly fine for four decades due to his young age when he inhaled the toy cone.
Surgery to remove the mass from the man's lung revealed what it really was - a small traffic cone toy he had inadvertently inhaled as a seven-year-old boy.
The freakish case came to light when the unnamed man, who was a lifetime smoker, reported a year-long, chronic cough to a local respiratory clinic.
Doctors then conducted a scan and because it he was a smoker, they allegedly assumed it was a tumour, the BBC reports.
The unidentified handyman, who lives in the United Kingdom, was suffering with coughing and mucus after being treated for pneumonia, and when doctors looked at X-rays of his lungs, they found something in his right lung that looked like a malignant tumour.
However, during a bronchoscopy, doctors did not detect any signs of cancer.
According to the report, the patient remembered regularly playing with - and even swallowing - pieces of Playmobil sets during his childhood.More news: Facebook sends team to Puerto Rico to get island back online
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Medicos therefore chose to take a look at that nasty something and found a Playmobil traffic cone in the midst of the mess.
Parents and guardians are strongly recommended to seek medical advice as soon as they realize their children have inhaled an object.
It was the first case, the doctors said, in which a foreign object lodged in a patient's body was undetected for 40 years.
The man made an nearly full recovery four months after the removal of the foreign body with his symptoms improving day by day, the report said.
It was not unusual for children to ingest small toys, it said, but "a case in which the onset of symptoms occurs so long after initial aspiration is unheard of". Often, the children exhibit the same symptoms. "The entire team was lifted as a result - we always feel so much better going home improving a patients condition".
For more than a year, he had a nagging cough. In case of infection, doctors may prescribe antibiotics and breathing therapy, according to an article by The New York Times.