Histology of Case 1 (A,C) and Case 2 (B,C). (A-B) The nodular lesions are well demarcated in both cases. (C-D) Vacuolar changes in the large cells with eosinophilic cytoplasm, vesicular nucleus, prominent nucleolus and neuropil-like background. There are also focally clustered small cells of oligodendroglial character (C). Scale bars: A = 200 μm; B = 2 mm; C-D = 50 μm.