We report the case of a patient with advanced HIV disease and cryptococcal meningitis, who after an initially good clinical and mycological response to systemic anti-fungal treatment developed symptomatic raised intracranial pressure 10 days after initiation of highly active anti-retroviral therapy. We describe the subsequent clinical management and the features that suggest that this persistently raised ICP was more likely due to an immune reconstitution syndrome (IRIS) following HAART rather than relapse of cryptococcal disease or failure of anti-fungal therapy.