. Journal of radiology . atid, or echinococcus cystsare nearly always single and oc-cur most often in the right lowerlobe, being secondary to cysts ofthe liver and gaining entrancethrough the diaphragm. An un-ruptured cyst presents a dense,round, sharply outlined rupture and partial drain-age, it may resemble a ring witha translucent center or a cavitypartly filled with fluid. Practically all of our cases ofpulmonary abscess show the hazy border characteristic of inflam-matory processes and are irregu-lar in shape. In one of ourcases of abscess of the lung, con-firmed at necrospy,
. Journal of radiology . atid, or echinococcus cystsare nearly always single and oc-cur most often in the right lowerlobe, being secondary to cysts ofthe liver and gaining entrancethrough the diaphragm. An un-ruptured cyst presents a dense,round, sharply outlined rupture and partial drain-age, it may resemble a ring witha translucent center or a cavitypartly filled with fluid. Practically all of our cases ofpulmonary abscess show the hazy border characteristic of inflam-matory processes and are irregu-lar in shape. In one of ourcases of abscess of the lung, con-firmed at necrospy, the roent-genogram revealed a single densearea, irregular in outline and solarge that the absence of otherdensities practically excluded ma-lignant metastasis if the exist-ence of the latter was consideredat all. Often interlobar effusions havea wedge-like form with one ormore curved borders. An in-stance of interlobar effusion dis-played a well rounded opacitybetween the right middle andlower lobes (Fig. 4). There were. Fig. 4—()—Interlobar round shadow is much like thatof the individual metastastie nodulesin Figure 1. but a metastatic noduleof this uze would be accompaniedby others. no accompanying lesions excepta large calcified gland in the lefthilum whose character was evi- Page Five PULMONARY METASTASIS—CARMAN dent, and malignant metastasiswas not even momentarily con-sidered.
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