A man in Ireland had been injecting his sperm into his arm for several months in an attempt to treat his back ache.
According to the doctors who reported the case, the man had been complaining about a severe, sudden onset of backache after lifting a heavy steel object.
The swollen region grew and hardened around the area on his arm where he'd injected his semen, and an x-ray revealed an area of trapped air beneath the man's skin.
He revealed that he injected one monthly "dose" of semen for 18 consecutive months using a hypodermic needle he bought online.
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Although there is a report of the effects of semen injection into rats and rabbits, there were no cases of intravenous semen injections into humans found across the literature, authors reported. However, before doctors were able to perform a routine surgery to cut and drain the collection, the patient chose to discharge himself.
This time around, he had injected three "doses" of semen, entering both his blood vessels and his muscles.
Officials said the man's back pain improved while he was in the hospital, and that they were able to give him intravenous antimicrobial treatment, but he discharged himself from the hospital before they could drain the "local collection".
Following the treatment with antibiotics, the redness on the man's arm spread and then hardened around the tiny injection wound over the next 24 hours.
But instead he needed to be hospitalised, and doctors have warned people of the risks posed by medical experimentation.