Extramammary orbital myofibroblastoma: a rare orbital tumor.

Extra-mammary myofibroblastomas are rare benign mesenchymal neoplasms, histologically and immune-phenotypically identical to mammary myofibroblastomas. Histologically, they are characterized by the abundance of spindle cells in hyalinized collagenous stroma with positive expression of CD 34 and desmin. We present an extremely rare case of extra-mammary myofibroblastoma of the orbit in a 29-year - old male who presented with painless proptosis of the right eye, with a description of clinical, radiological, and histological findings.