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Pathology of Fibroma of Tendon Sheath 

Dr Sampurna Roy MD         

 

Pathology Quiz Case- 66: Case history and images

Diagnosis: Pathology of Fibroma of Tendon Sheath

 

                                                                                                                      

 

 

Age: Young to middle aged individuals

Site: Commonly located in the upper limb (fingers) and is usually attached to the tendon.

Gross: Well circumscribed, lobulated fibrous nodule.

They are firm and rubbery and on section have a grayish-white appearance.

Microscopic features: 

The lesions consist of a dense fibrocollagenous tissue with a variable degree of collagenization and cellularity, the peripheral zone often being most cellular and containing slit-like vascular spaces.

In some cases there may be complete hyalinization. 

Mitotic activity depends on the cellularity of the lesion.

Other features:  Presence of inflammatory cells and myxoid stroma in some cases. Rare presence of giant cells or foamy cells. 

Immunohistochemistry:  Vimentin - Positive ;  muscle-specific actin  and smooth muscle actin - Positive.  Desmin - Negative ;  Factor XIIIa- Positive ;  CD34- Positive ; CD68 (+/- ).

Cytogenetics: Transclocation  2;11 has been found in one case.

Electron-microscopy:  Two main cell types were identified: Myofibroblasts and fibroblasts, the former dominating in cellular areas, the latter dominating in collagenized areas.

Differential diagnosis: Giant cell tumour of tendon sheath (localised nodular tenosynovitis) ; Circumscribed fibromatosis ; Nodular fasciitis;  Neurofibroma  ; Leiomyoma ;  Scar tissue ;  Benign fibrous histiocytoma ; 

Comparison with Giant cell tumour of tendon sheath:

This lesion is more common than fibroma of tendon sheath.

Histologically, the two tumours have separate and distinct histologic features. 

Fibroma of the tendon sheath is hypocellular, with slit-like vascular channels within a dense collagen matrix , whereas giant cell tumor of the tendon sheath is much more cellular and contains multiple multinucleated giant cells, foamy histiocytes, and hemosiderin.

All cases are treated effectively by local excision or reexcision of the growth.

 

Further reading:

Fibroma of tendon sheath. A clinicopathologic study of 32 cases.

Fibroma of tendon sheath arising from the radio-ulnar joint .

Translocation 2;11 in a fibroma of tendon sheath.

Fibroma and giant cell tumor of tendon sheath: a comparative histological and immunohistological study.

Tendon sheath tumours: a pathological study of the relationship between giant cell tumour and fibroma of tendon sheath.

Tendon sheath fibroma. A case report with immunohistochemical studies.
 

Fibroma of tendon sheath.

Fibroma of the tendon sheath. Diagnosis and differential diagnosis.  

Fibroma of tendon sheath: a clinicopathologic study.  

Fibroma of tendon sheath: a tumor of myofibroblasts. A clinicopathologic study of 18 cases.

Fibroma of tendon sheath. A light and electron-microscopic study of 6 cases.

 

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)


 

 

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