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Updated: Jul 15, 2026

Posterior Approach for Debridement of the Psoas Abscess
Published on: March 2, 2020
Dome-shaped lesion on chest radiograph: retroperitoneal abscess dissecting through the posterior chest wall
J Poulos1, S R Johnson, P Conrad
1Department of Internal Medicine, University of South Florida for Health Sciences, Tampa.
Abstract:
A 50-year-old man with an 8 x 4 cm mass on the posterior chest was found to have a large retroperitoneal abscess due to Klebsiella pneumoniae. The abscess dissected through the right lower lobe of the lung and the posterior chest wall to produce a subcutaneous mass. The source of the posterior chest wall mass appeared to be a perinephric abscess. A dome-shaped lesion above the right hemidiaphragm on chest radiograph resolved immediately with surgical drainage, suggesting that an abscess should be a prime consideration when one observes such a lesion on a chest film.
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