Without theaidofthoracotomy itisoften difficult toestablish adiagnosis incases oftumourinthe thorax. Certain formsofbenignpleural changes arelikely tobemisinterpreted asintrapulmonary, andoperation forsuspected lungtumourmaybe carried out.Inthecasesdescribed here, itwas possible toestablish thediagnosis without employingthoracotomy. Asverylittle attention appears tohavebeenpaidtothese lesions intheliterature, a numberofcasesrecently observed havebeen collected.
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L Tivenius (1963) studied this question.
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