Bronchial Cast Shadow Observed in Hilar Type Lung Cancer

概要

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We examined the frequency of occurrence of a rod-like abnormal shadow (bronchial cast shadow) accompained with a tumor shadow in hilar type lung cancer. The bronchial cast shadow was observed more frequently in cases of upper hilar mass shadow than in the lower hilar mass shadow. This difference in frequency could be explained by the gravitational effect on bronchial secretions. As to the production of bronchial cast shadow, two mechanisms could be concerned. The first one is due to mucus plugging in the bronchi distal to the tumor formation (mucoid impaction). The second mechanism is due to intrabronchial cellular growth (cellular impaction), and is exclusively seen in small cell carcinoma.<BR>The over-all incidence of bronchial cast shadow in hilar type lung cancer was 13.2% of 98 cases, indicating that it is not such a rare finding.<BR>Recognition of this bronchial cast shadow is important for differential diagnosis of abnormal shadow in the lung field roentgenologically.<BR>The two above mechanism should always be borne in mind as underlying pathophysiologic factors in the prothiction of the bronchial cast shadow observed in lung cancer.
特定非営利活動法人日本肺癌学会の論文