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J Korean Radiol Soc. 1995 Jun;32(6):933-936. Korean. Case Report.
Jung GS , Joh YD , Kim JM , Huh JD , Kwon SO , Oh KS .

Endobronchial metastasis from extrapulmonary carcinoma, both clinically and radiologically similar in appearance to a primary lung cancer, is rare. We present a case of endobronchial metastasis from parosteal osteosarcoma. The first abnormality noted on the chest radiography was tramline calcification with branching pattern along the right upper lobe bronchus and intermediate bronchus. This lesion progressed into a solid calcified nodule which increased in size. Another lesion with same pattern was also observed in the left lower lung zone.

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