What is the typical imaging appearance and clinical context of gelatinous pseudocysts in the brain?

Gelatinous pseudocysts are cystic lesions typically located in the basal ganglia, characterized by perivascular spaces filled with cryptococcal organisms. They are most commonly seen in immunocompromised patients, such as those with HIV/AIDS. On MRI, these lesions may appear as dilated Virchow-Robin spaces with T2 hyperintensity and may not enhance with contrast. It is crucial to differentiate them from other cystic lesions like lacunar infarcts or cystic neoplasms.