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Vol.46 No.1 contents | Japanese/English |
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- The 31st Diagnostic Imaging Seminar -
Radiologic-Anatomic Correlation of Normal Radiologic Appearances Seen in Chest Radiograph and CT Done for Better Medical Education
Harumi Itoh11Department of Radiology, Faculty of Medicine, University of Fukui, Japan
Purpose. Radiologic-Pathologic Correlation (RPC) has proven to be an effective tool not only to study diagnostic images of chest diseases but also to educate medical students and residents about chest radiology. Prior to teaching abnormal radiologic images sufficient time should be spent to teach normal images. In this study the RPC technique was applied to promote further understanding of normal chest radiographs and CT scans for senior staff responsible for teaching chest radiology. Methods. Six subjects were selected as following. 1. Radiologic appearance of upper thoracic vertebrae and ribs, 2. Visualization of bronchial walls, 3. Left hilar lucent zone, 4. Recesses marginated by azygos and aortic arches, 5. Azygos lobe, 6. Accessory fissure of lung base and inter- and intrasegmental septa. RPC was done to provide understanding of morphologic bases of normal radiologic findings. Results. The macroscopic and radiologic images of thoracic vertebrae, ribs and lung specimen were evaluated to explaine their normal radiologic findings. The results of such correlation were summarized as follows. 1. Lamina of vertebral arch was visualized due to anterior rotation of the upper thoracic vertebrae. The linear shadow superimposed on the rib corresponded to the inferior margin of the rib. 2. The anterior stripe of the left lower lobe bronchus and inferior stripe of the right middle lobe bronchus were formed by the lingual and right lower lobe, respectively. 3. The overhang of the lingula was responsible for forming radiologic lucent zone in the left hilum. 4. Azygos and aortic arches separated two recesses formed both in the upper and lower regions in the thoracic cavity. Inflated and fixed lung specimens were extremely useful to observe lung parenchyma fitting to these recesses. Posterior tracheal stripe and posterior stripe of the right intermedius bronchus was continuous in the lateral film of azygos lobe because of the unusual location of the azygos arch. 6. Branching linear shadows formed in the dome of the diaphragm were due to the accessory fissure of the lung base. The fissures varied in depth and were continuous to both pulmonary veins and inter- and intrasegmental septa. Conclusions. RPC was useful to evaluate normal radiologic findings and this study was well appreciated by both senior staff and medical students.
key words: Pre-existing structure of lung, Bronchial wall line, Hilum, Azygos arch, Accessory fissure
JJLC 46 (1): 49-57, 2006
