대한흉부영상의학회 Weekly Chest Cases

Diagnosis: Actinomycosis
Radiologic Findings: Figure 1 Chest radiographs show focal well-marginated consoliation in RLL medial basal areas.
Figure 2-6. Chest CT scans reveal about 6.7-cm extent consolidation with mild peripheral GGO and internal low density with small cavitary portion in RLL medial basal segment. Right interlobar lymph node was enlarged, suggesting reactive hyperplasia.
Brief Review: Bronchoscopy of the patient revealed hyperemic and edematous mucosa with purulent scretions in the right lower lobe bronchi. On bronchoscopic biopsy, chronic inflammation with ulceration and actinomycosis colonies were identified.
Parenchymal patterns of pulmonary actinomycosis include a peripheral pulmonary nodule, mass or consolidation, all of which may or may not be cavitary or multifocal. Typical CT findings are reported as central areas of low attenuation within the consolidation in 62
References: 1. Han JY, Lee KN, Lee JK, et al. An overview of thoracic actinomycosis: CT features. Insights Imaging 2013;4:245-252.
2. Kim TS, Han J, Koh W, et al. Thoracic Actinomycosis: CT Features with Histopathologic Correlation. AJR 2006;186:225-231.
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대한흉부영상의학회 Korean Society of Thoracic Radiology