Diagnosis: Arachnoid Cyst. For complete description of case, please visit http://www.radsWiki.net (sponsor of this image)

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http://www.google.com.eg/imgres?imgurl=http://api.ning.com/files/py5E2iOfdI9PdvDlXmkqbKgjZGyT*nIwFM*PwUn3aSK2qx4acXrI7N46vyaUrApka5aVWEZ1BUGwB-7*n4IzlrvFIeIyih4C/RadswikiArachnoid_cyst_001.jpg&imgrefurl=http://www.radrounds.com/photo/1791588:Photo:16098&usg=__7ugD4D1Zo232NNNl942PdY6PzT4=&h=700&w=700&sz=53&hl=en&start=6&itbs=1&tbnid=TrIDU4WWxhsPbM:&tbnh=140&tbnw=140&prev=/images%3Fq%3Darachnoid%2Bcyst%26hl%3Den%26sa%3DG%26gbv%3D2%26tbs%3Disch:1

Arachnoid cyst