tendon sheath fibroma
Immunochemistry:
vimentin +
muscle-?pecific actin +
smooth muscle actin +
desmin -
CD68 +/-
factor XIIIa +
CD34 +
Differential diagnosis
fibrous histiocytoma
nodular fasciitis
giant cell tumor of the tendon sheath
if nuclear pleomorphism: malignant fibrous histiocytoma
Cytogenetics
transclocation t(2;11)(q31-32;q12) (2q31-32 and 11q12)