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Noncontrast magnetic resonance T2-weighted imaging of the paranasal cavity at the initial diagnosis. (a) Axial, (b, c) coronal, and (d) sagittal views. The basilar artery located adjacent to the cyst (c) is indicated with the red arrow, and the cyst located adjacent to the brainstem (d) is indicated with the white arrow; however, the signal intensity of the lesion's contents is determined to be different from that of cerebrospinal fluid, therefore suggesting a primary cyst.
