Abstract
A peripheral lymph node large enough to appear on a chest roentgenogram as an intrapulmonary nodule is rare. The writers have found only one earlier report in the literature (1). Normally, in man, the pulmonary lymph nodes are found in the mediastinum and around the main bronchi at the hilum of the lung. They may be present along the lobar bronchi as far as the third or fourth branchings (2). Aggregations of lymphocytes are common at the bifurcation of the bronchi and beneath the pleura (3), but true lymph nodes large enough to be recognized roentgenographically are rarely found in the periphery of the normal lung. They are caused usually by the reaction of lymphoid tissue to infection, to inhalation of irritating substances, or to other noxious stimuli ( 4, 5). The purpose of this paper is to describe one patient in whom a solitary intrapulmonary nodule, noncalcified and noncavitary, which increased in size over a four-year period, was demonstrated to be a subpleural intrapulmonary lymph node.
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