The green bell pepper sign refers to the appearance of a rosette-forming glioneuronal tumor on gadolinium-enhanced magnetic resonance imaging (MRI).
Following administration of contrast, these tumors typically demonstrate central T1 low attenuation.
Classically, there is a peripheral rim of internal enhancement with small enhancing, centrally projecting nodules.
The enhancement pattern often reflects an 'axially' cut bell pepper, green or otherwise (red, orange, yellow). This vegetable is referred to as a 'capsicum' in Australia.
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