Calcifying fibrous tumor, formerly known as calcifying fibrous pseudotumor, is now recognized to occur at a wide variety of anatomical sites, mainly in children and young adults.
It which may recur locally and consists of hypocellular/hyalinized fibrous tissue containing scattered lymphocytes, plasma cells and stromal calcifications which are often psammomatous in appearance.
References
The evolving classification of soft tissue tumours: an update based on the new WHO classification. Fletcher CD. Histopathology. 2006 Jan;48(1):3-12. PMID: 16359532