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AJNR - American Journal of Neuroradiology

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Fetal Cerebral Cortex: Normal Gestational Landmarks Identified Using Prenatal MR Imaging

Catherine Garel^,a, Emmanuel Chantrel^a, Hervé Brisse^a, Monique Elmaleh^a, Dominique Luton^a, Jean-François Oury^a, Guy Sebag^a and Max Hassan^a

^a From the Department of Pediatric Radiology and Developmental Imaging Research Laboratory (JE 2149) UFR Lariboisière-Saint-Louis, Université Paris VII (C.G., E.C., M.E., G.S., M.H.); the Department of Radiology, Institut Curie, Paris (H.B.); and the Department of Gynecology Obstetric, Robert Debré Hospital, Paris (D.L., J.F.O.).

View larger version (77K): [in a new window]   FIG 1. Distribution of fetuses by gestational age (GA)

View larger version (84K): [in a new window]   FIG 2. Slice no. 1. T2-weighted midline sagittal image (20/9.2/12) (31 weeks' gestation). 1, parietooccipital fissure; 2, calcarine fissure; small arrow, marginal sulcus; large arrow, cingular sulcus.FIG 3. Slice no. 2. T2-weighted parasagittal image (20/9.2/12) at the level of the sylvian fissure (28 weeks' gestation). Opercularization of the insula is completed posteriorly (arrow). Anteriorly, the insula (star) is wide open

View larger version (88K): [in a new window]   FIG 4. Slice no. 3. T2-weighted anterior coronal image (20/9.2/12) at the anterior part of the frontal lobes (35 weeks' gestation). 1, superior frontal sulcus; 2, inferior frontal sulcus.FIG 5. Slice no. 4. T2-weighted coronal image (20/9.2/12) at the level of the third ventricle (35 weeks' gestation). Large arrow, cingulate sulcus; small arrow, callosal sulcus (barely visible); 1, superior temporal sulcus (anterior part); 2, inferior temporal sulcus; 3, external occipital temporal sulcus; 4, collateral sulcus.

View larger version (93K): [in a new window]   FIG 6. Slice no. 5. T2-weighted coronal image (20/9.2/12) at the level of the temporal horns (33 weeks' gestation). Large arrow, cingulate sulcus; small arrow, callosal sulcus (barely visible); 1, superior temporal sulcus (posterior part); 2, collateral sulcus; 3, hippocampal fissure.FIG 7. Slice no. 6. T2-weighted coronal image (20/9.2/12) at the level of the ventricular atria (33 weeks' gestation). 1, collateral sulcus; 2, intraparietal sulcus

View larger version (103K): [in a new window]   FIG 8. Slice no. 7. T2-weighted transverse image (20/9.2/12) at the level of the vertex (31 weeks' gestation). 1, precentral sulcus; 2, central sulcus (almost abutting the hemispheric fissure); 3, postcentral sulcus.FIG 9. Slice no. 8. T1-weighted transverse image (300/15/4) at the level of the third ventricle (29 weeks' gestation). The insula (star) is wide open