Cystic brain masses: use of variable-bandwidth steady-state free-precession MRI

Abstract

Our objective was to evaluate variable-bandwidth steady-state free-precession (VBSSFP) MRI in characterization of epidermoid tumors and arachnoid cysts. Axial conventional spin-echo and VBSSFP MR images were obtained in 12 patients with epidermoid tumors and 23 with arachnoid cysts and examined for ability to characterize these two lesions and to delineate lesion margin. On conventional spin-echo MRI, characterization of epidermoid tumor and arachnoid cyst was occasionally difficult, because of atypical cases. On VBSSFP MRI, lesion characterization was improved by recognition of two distinct patterns of internal texture and margins of the lesions could be separated from surrounding cerebrospinal fluid. The 25 operated cases confirmed the imaging impression. VBSSFP MRI complements conventional spin-echo imaging to help characterize epidermoid tumors and arachnoid cysts. The improved characterization of these cystic masses with VBSSFP MRI can help radiologists and surgeons establish more accurate preoperative diagnoses and more appropriate treatment plans.