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
transclocations involving chromosome 2
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