osteosteatoma

os·te·o·ste·a·to·ma

(os'tē-ō-stē'ă-tō'mă),
A benign mass, usually a lipoma or sebaceous cyst, in which small foci of bony elements are present.
[osteo- + G. stear, suet, fat, + -oma, tumor]

osteosteatoma

(ŏs″tē-ō-stē″ă-tō′mă) [″ + stear, fat, + oma, tumor]
A benign fatty tumor with bony elements.