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Electron microscopy of Crotalaria pulmonary hypertension.

The lungs of 11 rats fed on Crotalaria spectabilis seeds for periods ranging from 12 to 61 days were examined by both light and electron microscopy. The findings were compared with those obtained from nine control rats given a normal diet. Eight of the 11 test rats showed morphological evidence of pulmonary arterial hypertension in the form of right ventricular hypertrophy; the exceptions were rats killed after receiving the Crotalaria diet for 12, 22, and 29 days respectively. On light microscopy, all the test rats showed exudative lesions in the lungs consisting of eosinophilic alveolar coag