Prominent external occipital protuberance
The mass sensation at occiput region.
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Osseous proliferation at the posterior occipital region is related to prominent external occipital protuberance.
External occipital protuberance is a midline bony prominence in the occipital bone that ligamentum nuchae and trapezius muscle attach to its tip. The tentorium cerebelli attaches to its internal surface.
Exaggerated external occipital protuberance also is known as an occipital spur.