- Malignant melanoma (including melanoma of unknown primary site, recurrent and pretreated systemic melanoma and/or melanoma with parenchymal CNS metastases) with leptomeningeal metastasis as demonstrated by a positive CSF (cerebrospinal liquor) cytology AND/OR by the presence of characteristic signs and symptoms of leptomeningeal metastasis supported by an MRI scan indicating the presence of meningeal tumour