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In recent years, there have been many reports of haemorrhagic complications involving the intestinal tract due to the increasing use: of anticoagulant drugs. These have included cases of intramural haematomas in the duodenum and in the jejunum, which have been demonstrated radiologically by survey films and barium examinations. CULVER et colI. described a case of a jejunal haematoma and WIOT et coll, two cases of duodenal haematomas complicating treatment with anticoagulants. These cases were diagnosed on barium examinations but SEARS et coll. presented four cases of small bowel haematomas, three of which were diagnosable on survey films.The small bowel is most often affected, particularly the duodeno-jejunal junction region (ANSELL), but GABRIELE & CONTE described a case with haematoma of the sigmoid colon which developed during treatment with heparin; a narrowing of the lumen with oedematous folds was demonstrated by barium enema. The heparin treatment was discontinued and there was complete resolution of the lesion within three weeks. GIROUX et coIl. reported a pharyngo-Iaryngeal haematoma induced by anticoagulant therapy, and KIVIRANTA also described a laryngeal haematoma

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Summary Congenital renal arteriovenous fistulae are rare but are important lesions as they are a surgically curable cause of hypertension and cardiac failure. The angiographic features of such a fistula are described and the importance of correct diagnosis before irreversible changes occur, is stressed.