“…If these patients are kept under regular medical review then a clear diagnosis can be made in a substantial number of cases (Guckian & Perry 1968, Cunningham et al 1982. In the latter study 17 patients were followed up and single examples of the following conditions were subsequently diagnosed: tuberculosis, sarcoidosis, primary biliary cirrhosis, ulcerative colitis, carcinoma of rectum, hepatoma, alpha-l-antitrypsin deficiency and pulmonary fibrosis, Kveim-negative pulmonary fibrosis, gallstones, rheumatic heart disease and one death from mesenteric artery thrombosis.…”