Case report A 54 year old white woman presented in September 1986 with increasing abdominal distension and stool frequency. Weight loss amounted to 8 kg over three months. The menses had ceased at 51 years, and she was gravida 2 para 2. On physical examination she had an asthenic habitus and cachectic, height 162 cm, weight 56 kg, with diffusely pigmented skin, more apparent on pressure points-for example, over the knuckles, elbows, and knees. The right knee and proximal interphalangeal joint of the third right finger were swollen and painful. There was no history of previous arthritis or Raynaud's disease. A physical examination showed massive ascites, and after abdominal paracentesis a mobile mass of about 12 cm was felt in the left upper abdomen. Gynaecological examination showed a normal uterus, the adnexa could not be properly felt. Laboratory investigations showed raised lactic dehydrogenase (785 (normal <245 U/1)) and raised tumour marker CA 125 (1478 (normal <36 U/1)), but a normal carcinoembryonic antigen and haemoglobin concentration. Antinuclear factor, antiperinuclear factor, and IgM rheumatoid factor were negative; the C reactive protein and erythrocyte sedimentation rate were all normal. There was no eosinophilia. An abdominal ultrasound showed a large amount of ascites and a massively infiltrated omentum, but a normal liver, no signs of ureteral obstruction, and normal ovaries and uterus. Gastroscopy and a barium enema were also normal. An exploratory laparotomy was then performed. The omentum was massively infiltrated with tumour, and throughout the whole abdominal cavity nodules up to 2 mm were present. No tumour was felt in pancreas, gall bladder, stomach, large and small bowel. The uterus appeared normal, but on the surface of the otherwise apparently normal ovaries there were also numerous superficial tumour nodules. Microscopical examination of the intraperitoneal implants showed an undifferentiated serous cystadenocarcinoma, but in both ovaries only superficial tumour implants were found. Additional immunofluorescence testing of this tissue was negative for carcinoembryonic antigen and positive for epithelial membrane antigen, concordant with an adenocarcinoma, probably of primary coelomic origin.About three weeks after the operation she received six monthly courses of combination chemotherapy with intravenous carboplatin 300 mg/m2 and cyclophosphamide 750 mg/M2. The ascites disappeared and ultrasound scan and tumour marker CA 125 indicated a partial remission. During cytostatic treatment she complained of increasing pain in all finger joints and in the right knee, which became swollen and warm. Despite treatment with oral naproxen 250 mg four times a day she developed progressive swelling of the metacarpophalangeal and interphalangeal joints of both hands, and of the elbows and complained of stiff shoulders. A bone scan showed increased activity in the small and large joints (fig 1). A flexion contracture of the intrinsic hand muscles and palmar fascia