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Perirolandic Cortex of the Normal Brain: Low Signal Intensity on Turbo FLAIR MR Images¹

¹ From the Department of Radiology, Intermed Medical Center, Istanbul, Turkey (E.K.); and Department of Radiology, Kocaeli University Medical School, Turkey (A.A.). Received March 31, 2002; revision requested June 11; final revision received September 15; accepted September 30. Address correspondence to E.K., Department of Radiology, American Hospital, Guzelbahce sok 20, 80200 Nisantasi, Istanbul, Turkey (e-mail: e_karaarslan@hotmail.com).

PURPOSE: To evaluate the signal intensity (SI) characteristics of the perirolandic cortex (PRC) in the neurologically normal population on turbo fluid-attenuated inversion-recovery (FLAIR) magnetic resonance (MR) images.

MATERIALS AND METHODS: Turbo FLAIR MR images of 112 neurologically normal patients were evaluated retrospectively. SI of the PRC was graded by consensus of both authors as isointense (grade 0), mildly hypointense (grade 1), or definitely hypointense (grade 2) when compared to the SI of the superior frontal cortex. Kolmogorov-Smirnov and Kruskal-Wallis one-way analysis of variance tests were used for the statistical analysis of the differences in grades between the two sexes and between the age groups, respectively.

RESULTS: PRC was isointense (grade 0) in six (5%) and hypointense (grade 1 or 2) in 106 (95%) of 112 patients. The difference in grades was statistically significant between age groups (P < .001). Grade 0 was encountered most often in older patients and grade 2 in younger patients. There was no significant difference in grades between age-matched groups of male and female patients (P = .66).

CONCLUSION: On turbo FLAIR images the PRC generally has a low SI in the neurologically normal brain, and this helps as an additional landmark in identifying the sensorimotor cortex.

© RSNA, 2003

Index terms: Brain, anatomy, 13.92 • Brain, cortex, 13.92 • Brain, MR, 13.121411, 13.121413

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