Inclusion Body Fibromatosis : Immunohistochemistry

Comments:
Inclusion Body Fibromatosis - Immunohistochemical Profile: The spindle cells are positive for smooth muscle actin, desmin, calponin, CD99, and CD117. They are negative for cytokeratin, ER and PR. The inclusion bodies show variable actin immunoreactivity in formalin-fixed tissues and more consistent actin positivity in alcohol-fixed tissues.