Synopsis

 multinodular cartilaginous proliferation involving tenosynovium and/or subsynovial connective tissue
 mild or moderate atypia

Differential diagnosis

 chondroma of soft parts
 synovial chondromatosis

References

 Fetsch JF, Vinh TN, Remotti F, Walker EA, Murphey MD, Sweet DE. Tenosynovial (extraarticular) chondromatosis: an analysis of 37 cases of an underrecognized clinicopathologic entity with a strong predilection for the hands and feet and a high local recurrence rate. Am J Surg Pathol. 2003 Sep;27(9):1260-8. PMID: #12960811#