Image 1-In some areas, the tumor is composed of cellular nodules admixed with areas of hyalinization. In other foci, prominent bone formation is noted.

Image 2-On higher magnification, the spindle cells merge with areas of mature bone formation.

Image 3-A higher power magnification reveals minimal cytologic atypia of the spindle cells and benign bone formation.

Image 4-Another focus shows the spindle cells merging with areas of hyalinization.

Image 5-Highest magnfication reveals cytologic blandness of the spindle cells.

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Case Study


This is an occipital scalp lesion arising in a 49 year old man. There is a vague history of trauma at this site a few months earlier.

Last Updated April 25, 2005

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