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Some examples are given about very practical woodstove design rules derived from theoretical analysis. First the effect of insulating lids on the pans, and insulating stove walls are discussed. Second, a correlation is demonstrated between the stove geometry and performance in terms of net power density and convection efficiency. It is shown that the stove design involves a compromise between power and efficiency (or time and wood saving), but that performance is not inherent to the design: it depends on the user’s skill and care as well.

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While working with dynamic MR mammography (MRM) the need for an MR-guided localisation technique became obvious, because certain lesions were only detectable with dynamic MRM. We developed a technique to mark small breast lesions with MR guidance. Contrast-enhanced MRI was performed in a second examination, and with the use of markers on the skin a needle was placed next to the lesion. A charcoal mixture was injected around the lesion. We performed this procedure in five patients. Follow-up examinations have shown that the procedure was successful.

Since the use of cyclosporin (CsA) the incidence of post‐transplant arterial hypertension and erythrocytosis has increased sharply. In a retrospective analysis of 707 consecutive first cadaveric kidney graft recipients treated with CsA as basic immunosuppression, the effect of bilateral native nephrectomy on arterial hypertension and erythrocytosis was studied. Patient and graft survival as well as kidney function of the 264 nephrectomized patients were identical to those of the 443 non‐nephrectomized patients. In the nephrectomized patients the mean number of rejections during the first year was 0.62 ± 0.88 versus 0.78 ± 1.02 in the non‐nephrectomized patients (P= 0.0285). At 1 year after transplantation, 65.8% of the non‐nephrectomized patients needed hypotensive drugs versus 45.3% of the nephrectomized patients (P< 0.0001). Notwithstanding the use of more anti‐hypertensive drugs, diastolic blood pressure in the former group was significantly higher than in the latter group (87 ± 25 versus 83 ± 10 mm Hg; P< 0.02). During the first year 44 (9.9%) of the non‐nephrectomized patients had haemoglobin levels higher than 17 g/dl versus only six (2.3%) of the nephrectomized patients (P< 0.0001). Comparable differences were also found up to 5 years after transplantation. These findings indicate that native nephrectomy is helpful in controlling arterial hypertension and erythrocytosis.