| Mediastinal pseudomass caused by compression of the thymus in neonates with anterior pneumothorax. | |
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MedLine Citation:
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PMID: 1898549 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied the radiographs of 115 neonates with anterior pneumothoraces to determine how often the pneumothorax created the impression of a mediastinal pseudomass. The pseudomass results from compression of the thymus gland by air under pressure. To the unwary, the resulting configuration can lead to an erroneous diagnosis of a mediastinal mass. In experienced hands, however, it can serve as a strong clue to the presence of an underlying anterior pneumothorax. A pseudomass was present in 27 (33%) of 82 neonates with unilateral pneumothoraces and in 29 (88%) of the 33 patients with bilateral anterior pneumothoraces. A free lung edge was visualized in 26% of the patients with a unilateral pseudomass and in 55% of the neonates with a bilateral pseudomass. The pseudomass was large enough to potentially lead to a misdiagnosis in one third of the cases. In the other neonates the mass was smaller and not particularly problematic. The majority of the neonates with pseudomasses were large, not intubated, and not on positive-pressure assisted ventilation. Over half had no underlying pulmonary disease. The appearance of a mediastinal pseudomass on radiographs of neonates can obscure a pneumothorax, and lead to an erroneous diagnosis. Recognition of the pseudomass as a manifestation of pneumothoraces is important. |
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Authors:
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F N O'Keeffe; L E Swischuk; S D Stansberry |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: AJR. American journal of roentgenology Volume: 156 ISSN: 0361-803X ISO Abbreviation: AJR Am J Roentgenol Publication Date: 1991 Jan |
Date Detail:
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Created Date: 1991-01-23 Completed Date: 1991-01-23 Revised Date: 2008-02-15 |
Medline Journal Info:
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Nlm Unique ID: 7708173 Medline TA: AJR Am J Roentgenol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 145-8 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, University of Texas Medical Branch, Child Health Center C-65, Galveston 77550. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Diagnosis, Differential Female Humans Infant, Newborn Lung Diseases / complications, radiography Male Mediastinal Diseases / complications, radiography* Pneumothorax / complications, radiography* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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