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Fibroma of Tendon Sheath

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Comments:
This lesion presents as a slow-growing, well-circumscribed mass attached to tendons in hands and feet. The tendons of fingers, hand and wrist are most commonly involved. It starts as a fasciitis-like process which evolves into a hypocellular hyalinized nodule. The image shows a proliferation of spindle and stellate mesenchymal cells in a collagenous background. Cytologic atypia (degenerative type) is sometimes present; however, mitotic activity is not increased.

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