| Summary: | A set of one hundred and twenty nine patients with known primary malignancy and suspected brain metastasis was reviewed in present study. The patients were selected among patients presented to the MRI section of Imam Khomeini Hospital or a private MRI center in Tabriz (Iran). Primary tumor site, clinical manifestations, number and site of lesions were identified in this patient population. The primary tumor site was breast in 55 patients (42.6%), followed by lung (40.3%), kidney (7.7%), colorectal (4.6%), lymphoma (3.1%) and melanoma (1.5%). Most patients were presented with features of increased intracranial pressure (headaches and vomiting), seizures and focal neurologic signs. Single brain metastasis occurred in 16.3% of patients, while multiple lesions accounted for 83.7% of patients. Ninety seven patients had supratentorial metastases (75.2%). Twenty cases (15.5%) had metastases in both compartments. Infratentorial lesions were observed only in twelve patients (9.3%).
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