Surgical Pathology Criteria

Inclusion Body Fibromatosis (Infantile Digital Fibroma)

Supplemental Studies

Immunohistology

  Spindle Cells
Smooth muscle actin 100%
Calponin 100%
CD99 100%
Desmin 100%
CD117 75%
CD34 9%
Keratin Negative to rare (1 case+)
Beta catenin Negative
Inclusion bodies smooth muscle actin positive but may require special fixation or pretreatment

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