E.GAMY-J.MAHLAOUI-T.AMIL-S-CHAOUIR-A.HANINE- M.MAHI-S.AKJOUJ Medical imaging military hospital...
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Transcript of E.GAMY-J.MAHLAOUI-T.AMIL-S-CHAOUIR-A.HANINE- M.MAHI-S.AKJOUJ Medical imaging military hospital...
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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
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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.
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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.
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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.
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CT: CSF density bone remodeling, no contrast enhancement.
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MRI: T1/T2: iso intense to CSF
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DWI: no signalno contrast enhancement
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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.
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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.
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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
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DIFFERENTIAL DIAGNOSIS The chronic subdural hematoma: Lenticular, higher signal to CSF Subdural hygroma CAVITY porencephalic MEGAGRANDE TANK MALIGNANT CYSTIC NEURO-CYSTS ENTERIC CYST NEUROGLIAL
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TRAETMENT
KA asymptomatic abstention
KA giant symptomatic or asymptomatic high
risk of bleeding:
- Craniotomy + resection of the outer
mb
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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.