ABSTRACT
The mediobasal segment (S7) of the right lung has been considered to correspond to the cardiac lobe generally seen in mammals. To investigate fetal development of the right mediobasal segmental bronchus (B7), we examined paraffin-embedded serial sections of 15 embrynic and fetal lungs at 7-8 weeks (serial sections) as well as semiserial sections of 8 fetuses at 15-18 weeks (semiserial sections). All of the smaller specimens did not contain B7, but 2 of the 8 larger specimens carried B7: one was found in the immediately anterior side of the inferior pulmonary vein, while in the other, the subdivisions (B7a, B7b) were overriding the vein. Although the incidence might be underestimated because of observations using semiserial sections, the B7 was most likely to develop secondarily during a period from 8 to 15 weeks. Fetal topographical changes (mainly, the descent) of the middle lobe and the inferior pulmonary vein might relate with the secondarily budding of B7. The present result does not reduce a clinical relevance of B7 as a segmental bronchus of the lung segment system.
Subject(s)
Bronchi , Fetal Development , Fetus , Incidence , Lung , Mammals , Pulmonary Veins , VeinsABSTRACT
Congenital lobar emphysema is a rare disease and a cause of respiratory disturbance in newborns and infancts. The common locations of pulmonary involvement are the left upper lobe, right middle and upper lobe. We experienced a case of congenital lobar emphysema in a 9-month-old male infant. Chief complaints were dyspnea and tachypnea. Chest X-ray or CT scan revealed a hyperinflated right lower lobe, mediastinal shift to the left side and retrosternal herniaton of right lung. There was no evidence of infection and foreign body. This patient was successfully treated with right lower lobectomy. We report this case with a brief review of related literatures.
Subject(s)
Humans , Infant , Infant, Newborn , Male , Dyspnea , Emphysema , Foreign Bodies , Lung , Rare Diseases , Tachypnea , Thorax , Tomography, X-Ray ComputedABSTRACT
Congenital lobar emphysema is a rare disease and a cause of respiratory disturbance in newborns and infancts. The common locations of pulmonary involvement are the left upper lobe, right middle and upper lobe. We experienced a case of congenital lobar emphysema in a 9-month-old male infant. Chief complaints were dyspnea and tachypnea. Chest X-ray or CT scan revealed a hyperinflated right lower lobe, mediastinal shift to the left side and retrosternal herniaton of right lung. There was no evidence of infection and foreign body. This patient was successfully treated with right lower lobectomy. We report this case with a brief review of related literatures.