Sacral hemangioma - huge

Discussion:

The patient went on to have a biopsy. 

Histology

The sections show a soft tissue proliferation composed of a myxoid spindle cell matrix within which are dispersed vascular structures of varying diameter and thicknesses, typical of a hemangioma. The spindle cell matrix is considered reactive and coexists with fresh hemorrhage and hemosiderin deposition. The lesional tissue is present at the biopsy margins. 

Final diagnosis: intraosseus hemangioma.  

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