Intracystic Therapy

Cystic recurrences may be treated with intracavitary instillation of varying agents via placement of an Ommaya catheter.[9] These agents have included radioactive 32P or other compounds,[10-12]; [13][Level of evidence B4] bleomycin,[14]; [15][Level of evidence C2] or, previously, interferon-alpha (which is no longer commercially available).[16]; [17][Level of evidence C1]; [18][Level of evidence C2] These strategies have been useful in certain cases, and a low risk of complications has been reported. However, none of these approaches has shown efficacy against solid portions of the tumor.