Scedosporium Spondylodiscitis: Why Early ICU Sputum Cultures Shouldn't Be Dismissed as Colonization

New Evidence on Delayed Fungal Vertebral Osteomyelitis in Immunocompetent Patients

Spondylodiscitis comprises vertebral osteomyelitis, spondylitis, and discitis. It is most commonly caused by Gram-positive bacteria, primarily Staphylococcus aureus, whereas fungal spondylodiscitis is exceedingly rare, historically accounting for under 5% of spinal infections and predominantly confined to severely immunocompromised patients.

A newly published clinical investigation in the Journal of Bone and Joint Surgery (JBJS Case Connector, August 2026) from Amsterdam University Medical Center presents a critical analysis of delayed fungal spondylodiscitis caused by Scedosporium apiospermum in a previously healthy, immunocompetent 20-year-old male following accidental vehicular water submersion. The study highlights how pathogens identified in acute post-submersion respiratory cultures can easily be dismissed as benign colonization, leading to significant diagnostic delay.

What Did the Case Report Document?

The patient was involved in a single-vehicle car accident resulting in water submersion in an artificial canal with semistagnant water for approximately 5 minutes. Initial resuscitation achieved spontaneous circulation after pulseless electrical activity (PEA). Trauma CT showed bilateral pneumothorax and pulmonary aspiration without intracranial, abdominal, or spinal injury.

In the ICU, the patient developed ARDS, was placed on ECMO, and received intravenous prednisolone (70 mg/day for 5 days) for bronchospasm, alongside empiric IV ceftriaxone (2 g QD) and ciprofloxacin (400 mg TID). Sputum cultures grew Staphylococcus aureus, Stenotrophomonas maltophilia, Achromobacter species, Pantoea septica, Aspergillus fumigatus, and Scedosporium species. Because the patient improved clinically on room air with a normal leukocyte count (5.1 × 10⁹/L), antimicrobials were discontinued at Day 7 without initiating targeted antifungal therapy, as the sputum isolates were deemed non-pathogenic colonization.

The Critical Pitfall: Sputum Colonization vs. True Invasive Pathogen

Interpretation of early respiratory cultures after near-drowning is notoriously challenging. A multicenter cohort study from France (Reizine et al., Clin Microbiol Infect 2023) demonstrated that microbiologically proven pathogens in drowning-associated pneumonia are identified far less often than clinical pneumonia, highlighting significant discordance between early cultures and true causative organisms. In aspiration scenarios, early samples are frequently contaminated by oropharyngeal flora, while difficult-to-culture opportunistic molds like Scedosporium silently translocate across damaged alveolar-capillary membranes into the arterial circulation.

The Biopsy Journey: Overcoming False Negatives and Non-Causative Isolates

Two months post-trauma, when radiographs and MRI confirmed spondylodiscitis with elevated CRP (29 mg/L) and ESR (30 mm/h), establishing the microbiological diagnosis required a rigorous multi-step approach:

1. Initial Biopsy & Serology: The initial CT-guided biopsy of L1-2 grew no potential causal pathogens on routine cultures. Intergenic spacer profiling (IS-pro sequencing) identified Bacillus smithii, which was dismissed as non-causative due to low human pathogenicity. The serum (1-3)-β-D-glucan test was negative, histology showed only non-specific chronic inflammation without micro-organisms, and blood cultures remained negative.

2. Confirmatory Second Biopsy: A second CT-guided biopsy targeting levels L1-2 and Th10-11 successfully isolated Scedosporium apiospermum complex through routine mycological methods, demonstrating susceptibility to first-line Voriconazole.

Antifungal Pharmacodynamics: Why Voriconazole is First-Line over Amphotericin B

In accordance with combined European and American guidelines for rare mold infections (Hoenigl et al., Lancet Infect Dis 2021), oral Voriconazole 400 mg daily (200 mg BID) represents first-line therapy. Amphotericin B was explicitly dismissed due to poor activity against Scedosporium species, supported by an inherently high minimum inhibitory concentration (MIC) of 8 mg/L.

When the patient developed an allergic drug reaction (lip edema and skin ulceration) at Week 6, cross-reactivity with other azoles was considered likely. Due to limited alternative antifungals, clinicians adapted a structured 'watchful waiting' protocol with PET-CT at 7 months (confirming resolving FDG uptake and stable 24° kyphosis). At 1.5-year follow-up, complete anterior fusion at L1-2 and stable incomplete anterior fusion at Th10-11 were achieved with normalized inflammatory markers (CRP < 0.6 mg/L, ESR 2 mm/h) and full functional recovery without open surgery.

Review of Global Literature: 15 Cases in Immunocompetent Patients

To date, only approximately 15 cases of Scedosporium apiospermum spondylodiscitis have been reported in immunocompetent patients worldwide (including series by German et al., Levine et al., Garzoni et al., Mesfin et al., Blasco-Lucas et al., Cao et al., and Yan et al.). The documented diagnostic delay ranges from 28 to 120 days. Nearly all previous reports describe patients presenting with neurological deficits or requiring surgical corpectomy/instrumentation with prolonged voriconazole courses reaching up to 12 months.

My Take on the Findings — Dr. Deepak Garg

The central message of this study is that opportunistic pathogens identified after near-drowning should not be dismissed as colonization. When evaluating post-trauma spinal pain, cross-referencing initial ICU sputum records provides invaluable diagnostic clues. Furthermore, when non-diagnostic biopsies occur, repeating the image-guided biopsy is essential to avoid treating rare fungal pathogens with ineffective empiric antibacterials.

Take-Home Message

• Scedosporium apiospermum can cause delayed spondylodiscitis in young, immunocompetent patients following water submersion.

• Initial positive sputum cultures in the ICU may serve as early diagnostic sentinels rather than harmless colonization.

• (1-3)-β-D-glucan assays and initial needle biopsies may be false-negative; repeat CT-guided disc biopsy is warranted when endplate destruction progresses.

• Voriconazole is the preferred first-line therapy; Amphotericin B is ineffective due to high inherent MIC (8 mg/L).

• PET-CT and serial CRP/ESR surveillance allow successful conservative watchful waiting when drug hypersensitivity forces early treatment cessation.

Educational Disclaimer: This article is intended for medical education and scientific discussion. Individual clinical decisions must be guided by specialist evaluation and comprehensive microbiological workup.

Reference / Bibliography

1. Koning JDR, Baltes TPA, Geeraedts L Jr, van Daalen F, van Elzakker E, Stadhouder A. Delayed Complication of Near-Drowning Following a Car Crash: Spondylodiscitis by Scedosporium apiospermum. A Case Report. JBJS Case Connect. 2026;16(3):e26.00200. doi:10.2106/JBJS.CC.26.00200.

2. Hoenigl M, Salmanton-García J, Walsh TJ, et al. Global guideline for the diagnosis and management of rare mould infections. Lancet Infect Dis. 2021;21(8):e246-e257.

3. Reizine F, Delbove A, Tattevin P, et al. Clinical and microbiological features of drowning-associated pneumonia: a retrospective multicentre cohort study. Clin Microbiol Infect. 2023;29(1):108.e7-108.e13.