“…More than 70 cases of radiation-induced osteosarcomas of the orbit in retinoblastoma patients are known at the present time [Velhagen, 1947;Cahan et al, 1948;Reese et al, 1949;Tebbet and Vickery, 1952;Fran çois, 1953;Skolnik et al, 1956;Zimmer man and Ingalls, 1957, 3 cases;Walsh, 1957;Forrest, 1961, 2 cases;Chinaglia and Calzavara, 1965;Soloway, 1966, 3 cases;Kim et al, 1967;Yoneneyama and Green law, 1969;Sagerman et al, 1969, 9 cases;Garcia Alix and Otero, 1970;Jensen and Miller, 1971;Lennox et al, 1975, 8 cases. Although rarer, other radiation-induced malignant tumours have been observed in retinoblastoma patients (13 cases) : Reese et al [1949]: one rhabdomyosarcoma of the temporal muscle, one scar tissue sarcoma at the site of the temporal portal; Paufique [1953]: reticulosarcoma of the temporal region; Pettit et al [1954]: fibrosarcoma in the irradiated area; Forrest [1961]: 2 cases of fibrosarcomas, respectively, of the temple and the nose and 1 case of undifferentiated sarcoma of the orbit; Dollfus et al [1962]: fibrosarcoma of the orbit; Frezzotti and Guerra [1963]: fibrosarcoma of the nose; Raivio and Tarkkanen [1965]: fibrosar coma of the orbit; Ushigome et al [1972]: fibrosarcoma of the forehead ;Lommatzsch and Werner [1975]: rcticulosarcoma of the orbit; Lennox et al [1975]: 1 case of angiosarcoma and 1 case of fibrosarcoma.…”