Round Pneumonia in Adults, an Unusual Presentation of Lung Parenchymal Infection: A Report of Two Cases and Review of the LiteratureZylberman, Marcelo MD, FACP; Cordova, Ezequiel MD; Farace, Gustavo MDClinical Pulmonary Medicine: July 2006 - Volume 13 - Issue 4 - p 229-231 doi: 10.1097/01.cpm.0000227369.17269.7c Respiratory Infections Buy Abstract In Brief Author InformationAuthors Article MetricsMetrics Although round pneumonia is a well-known entity in children, it is uncommon in adults; 1% of pneumonia being round lesions. Indeed, less than 1% of coin lesions in an adult chest radiograph correspond to round pneumonia. Usually, round pneumonia mimics pulmonary or mediastinal masses; therefore, a broad differential diagnosis should be considered. The aim of this communication is to report 2 cases of round pneumonia in adults (one of them resulting from Chlamydia psittaci), its radiographic presentation, evolution, and outcome. A review of the literature on this subject is also included. In adults, approximately 1% of pneumonias presented as round lesions and round pneumonia comprises less than 1% of coin lesions present on chest x-ray. Round pneumonia simulates pulmonary or mediastinal masses. We report 2 cases of round pneumonia in adults. From the División Clínica Médica, Hospital Argerich, GCBA, Buenos Aires, Argentina. Address correspondence to: Marcelo Zylberman, MD, FACP, Olaya 1341 1°B (1414), Buenos Aires, Argentina. E-mail: email@example.com. © 2006 Lippincott Williams & Wilkins, Inc.