Diabetic Foot Files

Forgotten Infection Friday — Nocardia: The Weakly Acid‑Fast Impostor

24 min · 26 de jun de 2026
Portada del episodio Forgotten Infection Friday — Nocardia: The Weakly Acid‑Fast Impostor

Descripción

A 62-year-old man with poorly controlled diabetes presented with weeks of cough, weight loss, night sweats, and cavitary lung lesions initially suspected to be tuberculosis or malignancy. Sputum TB tests were negative and symptoms progressed. Bronchoscopic lung biopsy showed branching gram‑positive filaments that were weakly acid‑fast, consistent with Nocardia species. Nocardia commonly infects immunocompromised hosts, can disseminate to the brain, and is often mistaken for TB, fungal infection, or cancer. Diagnosis relies on modified acid‑fast stain, prolonged cultures, or molecular testing. Treatment requires prolonged antibiotic therapy (commonly TMP‑SMX), sometimes IV agents for severe disease, and early recognition in diabetic or immunosuppressed patients is critical to prevent dissemination.

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Portada del episodio Positive vs. Negative Surgical Margins- Every Millimeter Matters: Surgical Margins in Diabetic Limb Salvage

Positive vs. Negative Surgical Margins- Every Millimeter Matters: Surgical Margins in Diabetic Limb Salvage

In this episode of Diabetic Foot Files Dr. G explains why surgical margins in diabetic foot surgery — especially with osteomyelitis — directly affect recurrence, healing, and the risk of further amputation. She covers the difference between positive and negative margins, how pathology and imaging guide management, and how margin status influences antibiotics, reoperation, and prognosis. Practical steps to improve margin status are discussed, including thorough debridement to bleeding bone, preoperative imaging and vascular assessment, offloading, and close coordination with infectious disease. Key takeaway: achieving negative margins greatly increases healing odds, while residual infected bone significantly raises recurrence and higher-level amputation risk.

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