Doctors urge breakdancers to avoid spinning on their heads, due to the possibility of the appearance of a benign tumor, which for now they call "breakdancer's bump", writes the professional journal British Medical Journal.
One unnamed dancer from Denmark had to have it surgically removed, because it was thicker than 2.5 centimeters.
The condition is thought to be caused by friction between the scalp and the floor, combined with pressure from the dancer's body.
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The dancer from Denmark trained five times a week, spinning on his head for up to seven minutes, and wore a hat to hide the bulge.
He continued to spin despite the bump, which had grown larger and more painful over the years.
When he sought help, doctors at Copenhagen University Hospital had to rule out diseases, including cancer, before diagnosing a "hole in the head".
The condition usually starts with hair loss, but can develop into a bump on the head.
"Our findings do not show that vertigo should be abolished," said Dr. Kristijan Bastrup Sondergaard, one of the authors of the scientific paper published in the journal BMJ key report, for the PA news agency.
"However, breakdancers who notice the development of bulges should consider reducing or avoiding head twisting," he added.
"Although this rare condition is unique to breakdancers, successful surgical treatment can alleviate symptoms."
He stated that so far only one such case is known, and called for further study of breakdancing injuries.
"Now I can go out without a hat. which, of course, is a very nice feeling," said the anonymous dancer, adding that his head now looks "completely normal".
The report states that breakdancing involves "a series of complex and physically demanding techniques", which is why dancers are "particularly prone to injuries".
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