Granulocytic sarcoma (chloroma) is a malignant extra-medullary neoplasm of myeloid precursor cells. It is seen usually concurrent with or follows the diagnosis of acute myelogenous leukemia or other myeloproliferative disorders. Granulocytic sarcomas usually involve bones, periosteum, lymph nodes and shin. Involvement of the head and neck region is uncommon. Chloroma should be considered in the differential diagnosis of intracranial lesions. The computed tomography (CT) appearance of a cranial granulocytic sarcoma can be indistinguishable from a cerebral hematoma. We present a 12 year-old girl with scalp chloroma that was initially misdiagnosed as subdural effusion and later cerebral hematoma. An accurate and early diagnosis of this rare condition can prevent treatment delay and lead to good prognosis.