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IMAGING CONTRIBUTION IN ARACHNOID INTRACRANIAL CYST. E.GAMY-J.MAHLAOUI-T.AMIL-S-CHAOUIR-A.HANINE-M.MAHI-S.AKJOU J Medical imaging military hospital Mohammed V instruction –Rabat . NR3. Introduction . - PowerPoint PPT Presentation
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IMAGING CONTRIBUTION IN ARACHNOID INTRACRANIAL
CYST
E.GAMY-J.MAHLAOUI-T.AMIL-S-CHAOUIR-A.HANINE-M.MAHI-S.AKJOUJ
Medical imaging military hospital Mohammed V instruction –Rabat.
NR3
INTRODUCTION
Intracranial arachnoid cysts are defined as a pocket full
of intra-subarachnoid CSF without communication
with the ventricular system.
The aim of this study is to clarify the contribution of
computed tomography (CT) and especially MRI.
In the diagnosis with emphasis on information brought
by the sequences (diffusion) in the differential
diagnosis.
MATERIALS AND METHODS
CT scans performed in axial and coronal.
MRI includes the following morphological sequences
weighted in T1, T2, FLAIR, and T2 * sequences
RELEASE in the different planes.
RESULTS
CT shows a process of expansive cystic lesion that is
hypodense and the same signal as cerebrospinal fluid
(CSF), which can result in thinning of the cortex next,
there is no contrast enhancement.
MRI it has a signal identical to that of (LCS) on the
sequences T1 and T2 without contrast. However to make a
difference with an epidermoid cyst, FLAIR-weighted
sequences, distribution and CISS are a great contribution.
CT: CSF density bone remodeling, no contrast enhancement.
MRI: T1/T2: iso intense to CSF
DWI: no signalno contrast enhancement
DISCUSSION There is no causal link between the temporal lobe
hypoplasia and arachnoid cysts appear despite their association.
Hypothesis probable abnormalities of embryogenesis that affects
Independently, and the formation of the arachnoid, and the temporal lobe in some patients, is the effect of compression KA.
The search for evidence in favor of either MRI or hypogénésie compression of the temporal lobe by a KA.
DISCUSSION In The hypoplasia of the temporal lobe, temporal
lobe concave next to the KA, Discharge of the temporal horn and / or adjacent
structures;sinuosity, ripple temporal cortex next to the KA.
Decrease in the volume of adjacent parenchyma. Not discharge. No thinning of cortical bone next to the KA.
DIFFERENTIAL DIAGNOSIS Epidermoid cyst: Irregular edge in <cauliflower>, is insunie in tanks,
Includes vessels and nerves
Registered in 45% of cases at the basal cisterns.
Light Flair hyperintense signal and Hyper Distribution.
Light Flair hyperintense signal and Hyper Distribution
DIFFERENTIAL DIAGNOSIS The chronic subdural hematoma: Lenticular, higher signal to CSF Subdural hygroma CAVITY porencephalic MEGAGRANDE TANK MALIGNANT CYSTIC NEURO-CYSTS ENTERIC CYST NEUROGLIAL
TRAETMENT
KA asymptomatic abstention
KA giant symptomatic or asymptomatic high
risk of bleeding:
- Craniotomy + resection of the outer mb
CONCLUSION The MRI allows the diagnosis of intracranial
arachnoid cysts with characteristics of specific sequences that can differentiate epidermoid cysts.
With multi planar cuts it offers, it remains the best technique to assess the extent and anatomical relationships of these cysts.