Breakdancers have been advised to curb their head spinning after a Danish performer developed a cone-shaped lump on his head from too much rigorous gyrating.

The British Medical Journal (BMJ) revealed that the dancer developed a benign, one-inch thick tumour, or “headspin hole”, which had to be surgically removed.

A photograph of the lump published in the journal showed a strange but fairly unobtrusive cone shape poking out on top of the dancer’s head. He had reportedly taken to wearing a hat to conceal the bulge.

The dancer had been training five times per week in Denmark and developed the bulge from repeated pressure on the top of his head and the spinning movements.

He developed the lump over a period of 19 years of breakdancing, with it becoming particularly uncomfortable over the past five years.