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Focal cortical dysplasia - review.

Kabat J, Król P - Pol J Radiol (2012)

Bottom Line: A complete resection of the epileptogenic zone is required for seizure-free life.The abnormalities may also involve vital for life brain parts, where curative surgery will not be an option.Therefore, other diagnostic imaging techniques such as FDG PET, MEG, DTI and intra-cranial EEG are widely used to establish the diagnosis and to decide on management.With advances in both genetics and neuroimaging, we may develop a better understanding of patients with drug-resistant epilepsy, which will help us to provide more successful pharmacological and/or surgical treatment in the future.

View Article: PubMed Central - PubMed

Affiliation: Department of Diagnostic Imaging, Mazowiecki Regional Hospital in Siedlce, Siedlce, Poland.

ABSTRACT
Focal cortical dysplasia is a malformation of cortical development, which is the most common cause of medically refractory epilepsy in the pediatric population and the second/third most common etiology of medically intractable seizures in adults.Both genetic and acquired factors are involved in the pathogenesis of cortical dysplasia. Numerous classifications of the complex structural abnormalities of focal cortical dysplasia have been proposed - from Taylor et al. in 1971 to the last modification of Palmini classification made by Blumcke in 2011. In general, three types of cortical dysplasia are recognized.Type I focal cortical dysplasia with mild symptomatic expression and late onset, is more often seen in adults, with changes present in the temporal lobe.Clinical symptoms are more severe in type II of cortical dysplasia usually seen in children. In this type, more extensive changes occur outside the temporal lobe with predilection for the frontal lobes.New type III is one of the above dysplasias with associated another principal lesion as hippocampal sclerosis, tumor, vascular malformation or acquired pathology during early life.Brain MRI imaging shows abnormalities in the majority of type II dysplasias and in only some of type I cortical dysplasias.THE MOST COMMON FINDINGS ON MRI IMAGING INCLUDE: focal cortical thickening or thinning, areas of focal brain atrophy, blurring of the gray-white junction, increased signal on T2- and FLAIR-weighted images in the gray and subcortical white matter often tapering toward the ventricle. On the basis of the MRI findings, it is possible to differentiate between type I and type II cortical dysplasia. A complete resection of the epileptogenic zone is required for seizure-free life. MRI imaging is very helpful to identify those patients who are likely to benefit from surgical treatment in a group of patients with drug-resistant epilepsy.However, in type I cortical dysplasia, MR imaging is often normal, and also in both types the lesion seen on MRI may be smaller than the seizure-generating region seen in the EEG. The abnormalities may also involve vital for life brain parts, where curative surgery will not be an option. Therefore, other diagnostic imaging techniques such as FDG PET, MEG, DTI and intra-cranial EEG are widely used to establish the diagnosis and to decide on management.With advances in both genetics and neuroimaging, we may develop a better understanding of patients with drug-resistant epilepsy, which will help us to provide more successful pharmacological and/or surgical treatment in the future.

No MeSH data available.


Related in: MedlinePlus

Focal cortical dysplasia type IIb of the right frontal cortex in a 41-year-old female. Transverse TSE T2WI (magnification) (A); coronal TSE IR T1WI (B) and coronal TSE FLAIR T2WI (C). Sagittal TSE IR T1WI (D) and sagittal TSE FLAIR T2WI (E). Abnormal gyration of the left frontal cortex which presents very sharp demarcation with the white matter both on T1W and T2W images. Pronounced increased signal of the subcortical white matter on T2WI which tapers toward the ventricle (transmantle sign). The dysplastic cortex appears to be of normal thickness in (A) and (B). In (D), focal thickening of the cortex seems to be present (arrow), probably due to convolution of gyri. Courtesy of dr Norico Salamon. Epileptic Disorders, 2009; 11, 194–205.
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f4-poljradiol-77-2-35: Focal cortical dysplasia type IIb of the right frontal cortex in a 41-year-old female. Transverse TSE T2WI (magnification) (A); coronal TSE IR T1WI (B) and coronal TSE FLAIR T2WI (C). Sagittal TSE IR T1WI (D) and sagittal TSE FLAIR T2WI (E). Abnormal gyration of the left frontal cortex which presents very sharp demarcation with the white matter both on T1W and T2W images. Pronounced increased signal of the subcortical white matter on T2WI which tapers toward the ventricle (transmantle sign). The dysplastic cortex appears to be of normal thickness in (A) and (B). In (D), focal thickening of the cortex seems to be present (arrow), probably due to convolution of gyri. Courtesy of dr Norico Salamon. Epileptic Disorders, 2009; 11, 194–205.

Mentions: – FCD type II is characterized by cortical thickening, marked blurring of GM/WM junction, and in some patients with a slight increase of white matter signal on T2-weighted images, significant increase on FLAIR, decrease on T1, 3D volume GE T1 and significant decrease on T1 IR images. Altered white matter signal is often extended towards the ventricle (transmantle sign), which is observed exclusively in FCD type II. As a rule, blurring of GM/WM junction is usually more evident than in type I. Abnormal sulci and gyri are often found, clearly visualized by surface 3D. Perivascular space may also be enlarged (Figures 3,4).


Focal cortical dysplasia - review.

Kabat J, Król P - Pol J Radiol (2012)

Focal cortical dysplasia type IIb of the right frontal cortex in a 41-year-old female. Transverse TSE T2WI (magnification) (A); coronal TSE IR T1WI (B) and coronal TSE FLAIR T2WI (C). Sagittal TSE IR T1WI (D) and sagittal TSE FLAIR T2WI (E). Abnormal gyration of the left frontal cortex which presents very sharp demarcation with the white matter both on T1W and T2W images. Pronounced increased signal of the subcortical white matter on T2WI which tapers toward the ventricle (transmantle sign). The dysplastic cortex appears to be of normal thickness in (A) and (B). In (D), focal thickening of the cortex seems to be present (arrow), probably due to convolution of gyri. Courtesy of dr Norico Salamon. Epileptic Disorders, 2009; 11, 194–205.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3403799&req=5

f4-poljradiol-77-2-35: Focal cortical dysplasia type IIb of the right frontal cortex in a 41-year-old female. Transverse TSE T2WI (magnification) (A); coronal TSE IR T1WI (B) and coronal TSE FLAIR T2WI (C). Sagittal TSE IR T1WI (D) and sagittal TSE FLAIR T2WI (E). Abnormal gyration of the left frontal cortex which presents very sharp demarcation with the white matter both on T1W and T2W images. Pronounced increased signal of the subcortical white matter on T2WI which tapers toward the ventricle (transmantle sign). The dysplastic cortex appears to be of normal thickness in (A) and (B). In (D), focal thickening of the cortex seems to be present (arrow), probably due to convolution of gyri. Courtesy of dr Norico Salamon. Epileptic Disorders, 2009; 11, 194–205.
Mentions: – FCD type II is characterized by cortical thickening, marked blurring of GM/WM junction, and in some patients with a slight increase of white matter signal on T2-weighted images, significant increase on FLAIR, decrease on T1, 3D volume GE T1 and significant decrease on T1 IR images. Altered white matter signal is often extended towards the ventricle (transmantle sign), which is observed exclusively in FCD type II. As a rule, blurring of GM/WM junction is usually more evident than in type I. Abnormal sulci and gyri are often found, clearly visualized by surface 3D. Perivascular space may also be enlarged (Figures 3,4).

Bottom Line: A complete resection of the epileptogenic zone is required for seizure-free life.The abnormalities may also involve vital for life brain parts, where curative surgery will not be an option.Therefore, other diagnostic imaging techniques such as FDG PET, MEG, DTI and intra-cranial EEG are widely used to establish the diagnosis and to decide on management.With advances in both genetics and neuroimaging, we may develop a better understanding of patients with drug-resistant epilepsy, which will help us to provide more successful pharmacological and/or surgical treatment in the future.

View Article: PubMed Central - PubMed

Affiliation: Department of Diagnostic Imaging, Mazowiecki Regional Hospital in Siedlce, Siedlce, Poland.

ABSTRACT
Focal cortical dysplasia is a malformation of cortical development, which is the most common cause of medically refractory epilepsy in the pediatric population and the second/third most common etiology of medically intractable seizures in adults.Both genetic and acquired factors are involved in the pathogenesis of cortical dysplasia. Numerous classifications of the complex structural abnormalities of focal cortical dysplasia have been proposed - from Taylor et al. in 1971 to the last modification of Palmini classification made by Blumcke in 2011. In general, three types of cortical dysplasia are recognized.Type I focal cortical dysplasia with mild symptomatic expression and late onset, is more often seen in adults, with changes present in the temporal lobe.Clinical symptoms are more severe in type II of cortical dysplasia usually seen in children. In this type, more extensive changes occur outside the temporal lobe with predilection for the frontal lobes.New type III is one of the above dysplasias with associated another principal lesion as hippocampal sclerosis, tumor, vascular malformation or acquired pathology during early life.Brain MRI imaging shows abnormalities in the majority of type II dysplasias and in only some of type I cortical dysplasias.THE MOST COMMON FINDINGS ON MRI IMAGING INCLUDE: focal cortical thickening or thinning, areas of focal brain atrophy, blurring of the gray-white junction, increased signal on T2- and FLAIR-weighted images in the gray and subcortical white matter often tapering toward the ventricle. On the basis of the MRI findings, it is possible to differentiate between type I and type II cortical dysplasia. A complete resection of the epileptogenic zone is required for seizure-free life. MRI imaging is very helpful to identify those patients who are likely to benefit from surgical treatment in a group of patients with drug-resistant epilepsy.However, in type I cortical dysplasia, MR imaging is often normal, and also in both types the lesion seen on MRI may be smaller than the seizure-generating region seen in the EEG. The abnormalities may also involve vital for life brain parts, where curative surgery will not be an option. Therefore, other diagnostic imaging techniques such as FDG PET, MEG, DTI and intra-cranial EEG are widely used to establish the diagnosis and to decide on management.With advances in both genetics and neuroimaging, we may develop a better understanding of patients with drug-resistant epilepsy, which will help us to provide more successful pharmacological and/or surgical treatment in the future.

No MeSH data available.


Related in: MedlinePlus