Since Clarke et al. (1927) described primary pulmonary hypertension in two sisters, several families with more than one member involved have been reported (Lange, 1948;Dresdale, Michtom, and Schultz, 1954;van Epps, 1957; Coleman, Edmunds, and Tregillus, 1959;Fleming, 1960;Cahen et al., 1961;van Bogaert et al., 1961;Boiteau and Libanoff, 1963;Melmon and Braunwald, 1963;Parry and Verel, 1966;Kingdon et al., 1966). The present family is interesting because its several members suffered from more than one disease in common.
CASE REPORTSThe family first came under our observation in 1962. The grandparents were not known to have suffered from heart disease or lymphoedema. Sibs of the parents were described by them to be healthy. The family tree is shown in Fig. 1. Case 1. This 38-year-old woman, the mother of the other patients to be described, had had two episodes of high fever, and redness and swelling over both feet and legs, at the ages of 13 and 15 years, respectively. Both attacks lasted two days each. Ever since then she had noticed swelling over both feet. Physical examination showed her to be a healthy-looking woman with nonpitting oedema over both feet and some pitting oedema over the shins. There was no clubbing or cyanosis. Peripheral pulses were normal. A loud systolic bruit was audible over both temporal regions of the skull and was conducted down the carotids. Fundi and the central nervous system were normal. Cardiovascular and respiratory systems and abdomen were normal. Skiagram of the chest showed a rounded small shadow in the left infraclavicular region, which was thought to be an arrested Koch's lesion. Heart was normal in size. Urinalysis and routine blood investigations were normal, as was a 12-lead electrocardiogram. No acid-fast organisms were grown from the laryngeal swab. Case 2. The eldest child of Case 1 was 20 at the time of emination. His parents thought he had always been of low intelligence. He gave a history of repeated attacks of painful red swelling over both feet since the age of 8. He was a well-developed boy of subnormal intelligence; slight non-pitting oedema was present over the feet; heart, lungs, and abdomen were normal. A loud systolic bruit was heard all over the head and along the carotid vessels. Optic fundi were normal and there was no neurological deficit. Thoracic x-ray examination and electrocardiogram were normal. A right-sided carotid angiogram revealed a large extracranial arteriovenous malformation over the postero-superior parietal region (Fig. 2). The superficial temporal and occipital branches of the external carotid artery were tortuous and dilated and fed the malformation. No dye was seen in the internal carotid artery or its branches.Case 3. He was 16 years of age and had a history of attacks of fever and redness and swelling over the feet since the age of 8. He was found to have lymphoedema over both feet. The heart was clinically enlarged, with