The well known supraclavicular shadows present on most postero-anterior films of the chest are valuable aids to diagnosis, though their use has not been previously described. These shadows, as well as the sternomastoid shadows, are pointed out only as normal features, and the student is cautioned against confusing them with pathological lesions (Fig. 1). The frequency of masses in the neck resulting from lymphomata, tuberculosis, thyroid, salivary gland, laryngeal and superior sulcus tumors, and metastatic involvement from carcinoma of the breast and testes is well known. Any of these diseases may produce masses that partially or completely obliterate the supraclavicular fossae, either as a result of metastasis from a distant primary lesion or by direct extension (Fig. 2). In the past, masses in the neck have been recognized chiefly by a bulging silhouette, displaced muscle shadows, displacement of the trachea and esophagus, erosion or invasion of bone, and by the presence of calcific deposits. This report stresses the supraclavicular shadows as an additional aid in the detection of cervical masses and certain other abnormalities which involve the base of the neck. On the chest film of a white woman aged sixty, under study for possible recurrence of carcinoma of the breast, it was noted that the left supraclavicular shadow was absent, while the right was normal. Investigation revealed a 3.5-cm. firm, nodular, roughly spherical mass in the left supraclavicular fossa which proved histologically to be a metastasis. It was obvious from the film that there had been a right radical mastectomy, but no evidence of recurrent disease other than absence of the left supraclavicular shadow was present. During the few months since this sign was first observed, 11 additional cases in which abnormal supraclavicular shadows were present have been found (Table I). Case 2 is typical and will serve to illustrate the diagnostic significance of the supraclavicular shadows. On March 6, 1952, a postero-anterior film of the chest of a 35-year-old white woman revealed nothing abnormal except absence of the right supraclavicular shadow. Investigation confirmed the presence of supraclavicular masses on the right and disclosed the fact that the patient was receiving radiation therapy to the right supraclavicular region for Hodgkin's disease. A review of earlier films showed that in September 1950 there had been extensive mediastinal masses which completely disappeared after radiation therapy. The right supraclavicular shadow was found to be absent on the old films (Fig. 3), but its absence had not been detected. Chest films following completion of the recent course of irradiation showed that the supraclavicular shadow had reappeared. It was interesting to note that the shadow was now thicker than the normal one on the opposite side (Fig. 4).
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