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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).

View larger version (145K): [in a new window]   Figure 1a. Transverse turbo FLAIR MR images (8,000/110/2,500, echo train length of 11) show SI grades of PRC. (a) Grade 0 SI of the PRC in a 71-year-old man. The PRC (black arrows) is isointense with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (b) Grade 1 SI of the PRC in a 62-year-old woman. The PRC (black arrows) is mildly hypointense compared with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (c) Grade 2 SI of the PRC in a 33-year-old woman. The PRC (black arrows) shows definite hypointensity compared with the SFC (white arrow) (window width: 304, level: 347). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (d) Same section as c. On this image with a narrow window (width: 62, level: 347), the lower SI of the PRC (thin arrows) in comparison with that of the SFC (thick arrow) is more prominent.

View larger version (148K): [in a new window]   Figure 1b. Transverse turbo FLAIR MR images (8,000/110/2,500, echo train length of 11) show SI grades of PRC. (a) Grade 0 SI of the PRC in a 71-year-old man. The PRC (black arrows) is isointense with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (b) Grade 1 SI of the PRC in a 62-year-old woman. The PRC (black arrows) is mildly hypointense compared with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (c) Grade 2 SI of the PRC in a 33-year-old woman. The PRC (black arrows) shows definite hypointensity compared with the SFC (white arrow) (window width: 304, level: 347). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (d) Same section as c. On this image with a narrow window (width: 62, level: 347), the lower SI of the PRC (thin arrows) in comparison with that of the SFC (thick arrow) is more prominent.

View larger version (140K): [in a new window]   Figure 1c. Transverse turbo FLAIR MR images (8,000/110/2,500, echo train length of 11) show SI grades of PRC. (a) Grade 0 SI of the PRC in a 71-year-old man. The PRC (black arrows) is isointense with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (b) Grade 1 SI of the PRC in a 62-year-old woman. The PRC (black arrows) is mildly hypointense compared with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (c) Grade 2 SI of the PRC in a 33-year-old woman. The PRC (black arrows) shows definite hypointensity compared with the SFC (white arrow) (window width: 304, level: 347). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (d) Same section as c. On this image with a narrow window (width: 62, level: 347), the lower SI of the PRC (thin arrows) in comparison with that of the SFC (thick arrow) is more prominent.

View larger version (143K): [in a new window]   Figure 1d. Transverse turbo FLAIR MR images (8,000/110/2,500, echo train length of 11) show SI grades of PRC. (a) Grade 0 SI of the PRC in a 71-year-old man. The PRC (black arrows) is isointense with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (b) Grade 1 SI of the PRC in a 62-year-old woman. The PRC (black arrows) is mildly hypointense compared with the SFC (white arrow). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (c) Grade 2 SI of the PRC in a 33-year-old woman. The PRC (black arrows) shows definite hypointensity compared with the SFC (white arrow) (window width: 304, level: 347). Thick black arrow = precentral motor cortex, thin black arrow = postcentral somatosensory cortex. (d) Same section as c. On this image with a narrow window (width: 62, level: 347), the lower SI of the PRC (thin arrows) in comparison with that of the SFC (thick arrow) is more prominent.

View larger version (160K): [in a new window]   Figure 2. Transverse turbo FLAIR MR image obtained in a 33-year-old woman. There is a very thin ribbon surrounding the central sulcus (superficial part of the PRC) (short arrows). The deeper part of the PRC (arrowhead) is definitely hypointense (grade 2) compared with the SFC (long arrow) and cannot be differentiated from the adjacent subcortical white matter.