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已发表论文
复发性皮下气肿诊断困难：免疫功能正常女性患者的星形诺卡菌感染
Authors Gu P , An X, Wei Y, Xu W, Han Y, Gao Q, Liu S, Bi Y
Received 24 July 2025
Accepted for publication 17 November 2025
Published 12 January 2026 Volume 2026:19 556094
DOI https://doi.org/10.2147/IDR.S556094
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Dr Hazrat Bilal
Pengfei Gu,1,* Xingguo An,1,* Yukun Wei,1,* Wenjian Xu,1 Yong Han,1 Qiang Gao,1 Song Liu,1 Yueyang Bi2
1Department of Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, 256603, People’s Republic of China; 2Department of Pulmonary and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou, Shandong, 256603, People’s Republic of China
*These authors contributed equally to this work
Correspondence: Song Liu, Email Liusong3721@163.com Yueyang Bi, Email Leafbyy@163.com
Abstract: This case report describes an immunocompetent female with recurrent subcutaneous emphysema and refractory soft tissue infections involving multiple non-contiguous sites—bilateral breasts, chest wall, and upper limb—over seven years, consistent with disseminated nocardiosis. Initial presentations mimicked bacterial mastitis, with localized swelling, erythema, crepitus, and elevated inflammatory markers. Despite repeated incision and drainage procedures, antibiotic therapies, and bilateral mastectomies, symptoms recurred persistently. Conventional microbial cultures repeatedly failed to identify a pathogen, while metagenomic next-generation sequencing (mNGS) of a late-stage chest wall lesion ultimately revealed Nocardia farcinica, an opportunistic actinomycete with a known propensity for systemic dissemination even in immunocompetent hosts. The patient’s atypical clinical course—marked by multifocal gas-forming soft tissue necrosis, chronic recurrence, and resistance to empiric treatments—underscores the diagnostic challenges posed by fastidious pathogens like Nocardia. Key lessons include the utility of mNGS in identifying culture-elusive organisms, the importance of considering nocardiosis in refractory subcutaneous infections regardless of immune status, and the necessity of prolonged, targeted antimicrobial regimens (eg, sulfonamides) combined with surgical intervention. This case highlights evolving paradigms in managing complex disseminated infections through advanced genomic diagnostics and multidisciplinary approaches.
Keywords: Nocardia farcinica, subcutaneous emphysema, refractory soft tissue infection, metagenomic next-generation sequencing, mNGS, immunocompetent host
1Department of Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, 256603, People’s Republic of China; 2Department of Pulmonary and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou, Shandong, 256603, People’s Republic of China
*These authors contributed equally to this work
Correspondence: Song Liu, Email Liusong3721@163.com Yueyang Bi, Email Leafbyy@163.com
Abstract: This case report describes an immunocompetent female with recurrent subcutaneous emphysema and refractory soft tissue infections involving multiple non-contiguous sites—bilateral breasts, chest wall, and upper limb—over seven years, consistent with disseminated nocardiosis. Initial presentations mimicked bacterial mastitis, with localized swelling, erythema, crepitus, and elevated inflammatory markers. Despite repeated incision and drainage procedures, antibiotic therapies, and bilateral mastectomies, symptoms recurred persistently. Conventional microbial cultures repeatedly failed to identify a pathogen, while metagenomic next-generation sequencing (mNGS) of a late-stage chest wall lesion ultimately revealed Nocardia farcinica, an opportunistic actinomycete with a known propensity for systemic dissemination even in immunocompetent hosts. The patient’s atypical clinical course—marked by multifocal gas-forming soft tissue necrosis, chronic recurrence, and resistance to empiric treatments—underscores the diagnostic challenges posed by fastidious pathogens like Nocardia. Key lessons include the utility of mNGS in identifying culture-elusive organisms, the importance of considering nocardiosis in refractory subcutaneous infections regardless of immune status, and the necessity of prolonged, targeted antimicrobial regimens (eg, sulfonamides) combined with surgical intervention. This case highlights evolving paradigms in managing complex disseminated infections through advanced genomic diagnostics and multidisciplinary approaches.
Keywords: Nocardia farcinica, subcutaneous emphysema, refractory soft tissue infection, metagenomic next-generation sequencing, mNGS, immunocompetent host