WHEN an extrapleural mass is seen partially en face, it may simulate a pulmonary parenchymal lesion. However, the presence of an incomplete border is a clue to the true nature of the mass.1
Report of a Case
A routine chest x-ray film (posteroanterior view) of a 21-year-old man showed a large lesion in the left midlung field with an incomplete border sign laterally, indicating an extrapleural mass (Fig 1). The oblique view showed typical signs of an extrapleural mass (Fig 2). The presence of destructive changes in the fourth rib confirmed its extrapleural location. This lesion appeared to arise from the fourth rib at the costochondral junction. The preoperative diagnosis was a chondrosarcoma of the rib; this was confirmed at surgery. The tumor was completely removed en bloc, along with the third and fifth ribs. The surgical defect was closed with Teflon mesh, and the patient made an uneventful
Ellis R. Incomplete Border Sign of Extrapleural Masses. JAMA. 1977;237(25):2748. doi:10.1001/jama.1977.03270520058027
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