What are the most common masses found in the body of the lateral ventricle in patients aged 10 to 40 years, and how can they be differentiated radiologically?

The most common masses in the lateral ventricle body for patients aged 10-40 are ependymoma, pilocytic astrocytoma, and central neurocytoma. Ependymomas often appear as heterogeneous masses with calcifications and can enhance with contrast. Pilocytic astrocytomas typically show cystic components with an enhancing mural nodule. Central neurocytomas are characterized by intraventricular location, calcifications, and a 'bubbly' appearance on imaging. A common pitfall is mistaking these for choroid plexus papillomas, which are more common in younger patients and have a different enhancement pattern.