1. 1956 Paterson and McKissock 1956;Crawford; Russell
2. Castaigne et al. Papatheodorou et al. 1961
3. Kamrin and Buchsbaum 1965
4. Scott et al. Kendall and Claveria 1976
5. choroidal artery was rather prominent in case 1 (Fig. 1), but no pathological vessels were outlined Address for reprint requests: Professor L. Symon, The National Hospital, Queen Square, London WC1N 3BG,1978