RESUMO
The parents of a year old female infant sought medical advice for a rapidly increasing proptosis of her right eye of three-month duration. There were no signs of any primary systemic disease or malignancy on clinical and laboratory evaluations. The X rays and computerized tomography [CT] scan of the right orbit showed a hazy orbital mass. Immunohistochemical markers were employed. The biopsy tissue was negative for epithelial membrane antigen [EMA], ruling out epithelial tumors. The positive result for desmin confirmed that the lesion was a mesenchymal/muscle cell tumor. The patient had local radiotherapy followed by surgical excision of the regressed tumor. Adjuvant chemotherapy now is under deliberation. [Pakistan Journal of Ophthalmology 9:97-99, October, 1993]