Dysgerminoma of the ovary: good prognosis even in advanced stages.

Dysgerminoma is a rare germ cell tumor of the ovary. It constitutes about 0.5% of all ovarian malignancies. During a 12-year period (1978-1989), 22 patients were treated at the National Cancer Institute, Cairo, Egypt. According to the FIGO classification system, 4 patients were allocated to Stage I, 2 were Stage II, 13 were Stage III, and 3 were Stage IV. The 5-year actuarial survival rate for all patients was 76%. Conservative treatment in addition to retrieval therapy upon recurrence could achieve 100% survival rate in Stage I patients. Surgery followed by irradiation resulted in a 66% 5-year actuarial survival rate in Stage III and 67% in Stage IV. Retroperitoneal lymph nodes seemed to have a better survival than peritoneal tumor extension. The adoption of an elective irradiation policy to the mediastinum and supraclavicular area seemed to have a good influence on prognosis. However, the extent of surgery performed could not be shown to affect survival.     

Non-Hodgkin's lymphoma with protein S deficiency]

Venous thrombosis is rare in children. It can be either acquired or of constitutional origin. Thrombosis during non-Hodgkin lymphoma remains exceptional and is usually locally associated to the tumoral process, raising the issue of its tumoral or cruoric nature. The treatment is based on anticoagulation concomitantly to chemotherapy. We report on a 4-year-old boy admitted for mediastinal non-Hodgkin lymphoma, who developed a thrombosis of the superior vena cava associated to protein S-deficiency. The mechanism of thrombosis may have been multifactorial: associated protein S-deficiency, vascular compression, tumoral process and chemotherapy.     

Measurement of the fast neutron flux in the MNSR inner irradiation site.

The WIMSD4 code was used to calculate the fast neutron flux spectrum and the fast neutron fission cross-sections for (238)U, using six energy groups ranging from 0.5 to 10 MeV. These results, with the measured radioactivities of the (140)Ba, (131)I, (103)Ru, (95)Zr and (97)Zr fission products emerging from the fission of the (238)U foil covered with a cadmium filter, were used to measure the fast neutron flux in the Syrian Miniature Neutron Source Reactor inner irradiation site.