Pneumo-diffusion Dysfunctions For Anatomo-pathological Abnormalities Of The Diffusing Membranes            The clinical and functional aspects alterations in pneumo-diffusion include some diffuse lung injuries, fine disseminate reduction, saturation of the arterial oxygen tension and reduced lung volume conserving the maximum breath.      The capacity is relatively normal. Other aspects include hyperventilation, tensions of the alveolar oxygen, reduced      diffusing pulmonary capacity, variable degrees of polycythemia, dyspnea, cyanosis, and pulmonary hypertension. Some alterations of the diffusing membrane can be fulfilled through surgery when prematurely diagnosed.