CT of lytic lesion concerning for eosinophilic granuloma (EG) or hematologic malignancy (HM).Sharply defined lytic lesion zygomatic process of the left frontal bone forming the superolateral wall of the left orbit with intraorbital extension; also extension to the left temporal fossa as described. Findings probably indicate eosinophilic granuloma. Differential is hematologic malignancy; mild left proptosis; hematologic workup requested for further assessment; biopsy of the lesion with imaging guidance can be considered following metastatic and hematologic workup.