Prominent external occipital protuberance
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Palpable mass in the occipital region for many years.
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Focal midline bony prominence (spur-like bony protrusion) in the posterior occipital protuberance.
The external occipital protuberance is a midline bony prominence in the occipital bone in which the ligamentum nuchae and trapezius muscle attach to its tip. The tentorium cerebelli attaches to its internal surface.