Doctors have extracted a live worm hiding inside a Japanese woman’s left tonsil.
The horror discovery was made by ear, nose and throat specialists who suspect the parasite’s presence was the result of the woman eating raw fish.
Measuring 4cm, the nematode roundworm was still alive when it was removed by doctors at St Luke’s International hospital in Tokyo.
Before the shock diagnosis the woman, 25, had complained of throat pain and irritation, a report in the American Journal of Tropical Medicine and Hygiene stated.
After the pest was extracted she was said to have felt much better.
Her “symptoms rapidly improved” the case study report said.
Nematode roundworm’s are to live in raw fish and meat and the patient said she had eaten assorted sashimi five days prior.
Doctors said the worm had emerged from worm egg larva hidden inside the national dish.
The authors of the study said cases like this had “markedly increased worldwide” due to the popularity of sushi and sashimi dishes.
The alert was raised after a 32-year-old Portuguese man was treated in Lisbon after parasite larvae was found on his stomach lining.
The man’s doctor, Joana Carmo said most cases of anisakiasis occurred in Japan but it was becoming more common in Western countries.
The only reason doctors found it was because he had been suffering stomach pain, vomiting and fever for a week.
Blood test results showed he had mild inflammation and the area below his ribs was tender.
The doctors only began to suspect he might have anisakiasis (a parasitic disease) after they asked him if he had eaten sushi recently.