A case of a ruptured bronchus, following endobronchial intubation with a double-lumen tube, is reported. Possible contributing factors and causes of this bronchial rupture are discussed and careful monitoring of cuff pressures is advocated.

A 27-year-old woman was investigated for a tumour of the posterior chest wall. This was excised surgically and histologically it proved to be a hyaline vascular type of angiofollicular lymphoid hyperplasia or Castleman's disease. This is the third case from the literature of such a tumour arising from the intercostal space. Surgical excision has been proved curative until now with no recurrence.

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Yorkers. Bradlow et al. (1962) showed that some of the coagulation factors were lower and that fibrinolysis was accelerated in South African Bantus compared with white controls. Preoperative and postoperative coagulation studies in our patients may help to explain the relatively low incidence of postoperative deep vein thrombosis among them.We acknowledge with thanks the financial support given to this study by the International Atomic Energy Agency, Vienna. We also thank our surgical colleagues in Khartoum Civil Hospital who allowed us to study their patients.References Bradlow, B. A., Antonis, A., and Bearson, I. S. (1962). African Journal of Medical Science, 27, 15. Browse, N. L., and Negus, D. (1970). British Medical journal, 3. 615. Burkitt, D. P. (1972). British Medical journal, 3, 556. Cleave, T. L. (1972 10 MHz frequency and the probe is coupled to the skin using an acoustic coupling gel (Parker Aquasonic). The shift in the reflected signal is proportional to the velocity of blood flow in the vessel under study. The difference between the transmitted and received frequencies is amplified and is audible in high fidelity headphones. The Parks models have several advantages over other models used in similar studies because of the focused nature of the beam and the frequency used. The probe is applied over the femoral artery pulse and then moved

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