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Onychomycosis caused by Acremonium — Clinical Guidelines

Overview

Onychomycosis caused by Acremonium species is a fungal infection affecting the nails, characterized by thickening, discoloration, and crumbling of the nail plate. This condition is clinically significant due to its chronic nature and potential complications, including secondary bacterial infections and significant morbidity. It predominantly affects adults, with no clear gender predilection, though immunocompromised individuals and those with predisposing factors such as trauma or underlying dermatological conditions are at higher risk. Accurate diagnosis and timely treatment are crucial in day-to-day practice to prevent progression and manage symptoms effectively 1 2.

Pathophysiology

Acremonium species, typically opportunistic pathogens, invade the nail apparatus through microtrauma or compromised nail integrity. The fungi proliferate within the nail bed and matrix, leading to structural changes in the nail plate. At a molecular level, these fungi disrupt keratinization processes, causing the nail to become brittle and discolored. Cellular responses include inflammation mediated by immune cells, which attempt to combat the fungal invasion but often contribute to the clinical symptoms observed. The chronic inflammatory response can exacerbate nail dystrophy and may lead to deeper tissue involvement if left untreated 1 3.

Epidemiology

The incidence of onychomycosis caused specifically by Acremonium species is less documented compared to more common pathogens like dermatophytes. However, cases are increasingly recognized, particularly in immunocompromised individuals and those with prolonged exposure to environmental sources where Acremonium thrives, such as marine environments. Geographic distribution is not extensively delineated, but reports suggest a global presence with sporadic occurrences. Risk factors include immunosuppression, chronic diseases, and occupational exposure to contaminated environments. Trends indicate a rising awareness and identification of Acremonium infections, possibly due to improved diagnostic techniques 2.

Clinical Presentation

Patients typically present with nail changes including yellow or brown discoloration, thickening, and crumbling of the nail plate. The infection may start subtly but progresses to involve multiple nails over time. Atypical presentations can include minimal pain or discomfort, making early diagnosis challenging. Red-flag features include rapid progression, systemic symptoms (indicative of disseminated infection), and involvement of multiple nails simultaneously. Prompt recognition is essential to prevent further complications and to guide appropriate management 2.

Diagnosis

Diagnosing onychomycosis caused by Acremonium involves a combination of clinical assessment and laboratory testing. The diagnostic approach includes:

Clinical Evaluation: Detailed history and physical examination focusing on nail changes.

Microscopy: Direct microscopy of nail scrapings using potassium hydroxide (KOH) preparation to identify fungal elements.

Culture: Fungal cultures on specialized media (e.g., Sabouraud dextrose agar) are crucial for identifying Acremonium species, as they can differentiate between various fungal pathogens. Cultures may take several weeks due to the slow growth of Acremonium.

Molecular Techniques: Polymerase Chain Reaction (PCR) can offer rapid and specific identification but may not be universally available.

Specific Criteria and Tests:

Nail Scrapings: Obtain from the most affected nail, preferably the proximal nail fold.

KOH Preparation: Look for hyphae or spores; sensitivity is moderate.

Culture: Positive identification requires growth confirmation; incubation period up to 4 weeks.

Differential Diagnosis: Rule out non-fungal causes like psoriasis, lichen planus, and trauma-induced changes.

PCR Testing: For rapid confirmation if available; specificity is high but availability varies 2 3.

Differential Diagnosis

Psoriasis: Characterized by pitting and onycholysis, often with associated skin lesions.

Lichen Planus: Presents with nail thinning, ridging, and subungual hyperkeratosis without fungal elements on microscopy.

Trauma: Physical injury can mimic fungal changes but lacks fungal elements in scrapings 2.

Management

First-Line Treatment

Antifungal Agents: Oral terbinafine (250 mg daily for 6 weeks) is often recommended due to its efficacy and relatively short duration.

Itraconazole: 200 mg daily for 3 months can be used if terbinafine is contraindicated or ineffective.

Monitoring: Regular follow-up to assess clinical improvement and monitor for side effects such as liver function abnormalities.

Specifics:

Terbinafine: 250 mg QD for 6 weeks (Evidence: Strong 2)

Itraconazole: 200 mg QD for 3 months (Evidence: Moderate 2)

Second-Line Treatment

Fluconazole: 100-200 mg daily for 6-12 weeks, particularly useful in cases of resistance or intolerance to first-line agents.

Amphotericin B: Reserved for severe or refractory cases, administered intravenously under specialist supervision.

Specifics:

Fluconazole: 100-200 mg QD for 6-12 weeks (Evidence: Moderate 2)

Amphotericin B: IV, specialist referral required (Evidence: Weak 2)

Refractory Cases

Consultation: Referral to a dermatologist or infectious disease specialist for tailored therapy.

Combination Therapy: Consider combining oral antifungals with topical treatments like ciclopirox nail lacquer.

Surgical Intervention: Partial or complete nail avulsion may be necessary in resistant cases.

Specifics:

Topical Ciclopirox: Apply daily until resolution (Evidence: Moderate 2)

Surgical Avulsion: Indicated in refractory cases (Evidence: Expert opinion)

Complications

Secondary Bacterial Infections: Common in chronic cases, requiring antibiotic therapy.

Disseminated Infection: Rare but serious, particularly in immunocompromised patients, necessitating systemic antifungal treatment.

Nail Deformity: Persistent changes may require surgical correction post-infection resolution.

Management Triggers:

Persistent pain or swelling (refer for secondary infection)

Systemic symptoms (consider disseminated infection)

Failure to respond to initial treatment (consider referral) 2.

Prognosis & Follow-up

The prognosis for onychomycosis caused by Acremonium is generally good with appropriate treatment, though complete resolution can take months to years. Prognostic indicators include early diagnosis, adherence to treatment, and absence of underlying immunosuppression. Follow-up intervals typically involve clinical reassessment every 3-6 months until resolution, with periodic nail scrapings to confirm clearance. Regular monitoring helps in early detection of recurrence or complications 2.

Special Populations

Immunocompromised Individuals: Higher risk of severe infection and complications; close monitoring and potentially longer treatment durations are advised.

Elderly Patients: May have reduced immune response; careful selection of antifungal agents considering renal and hepatic function.

Occupational Exposure: Individuals exposed to marine environments or contaminated soil should practice strict hygiene and wear protective gear to minimize risk 2.

Key Recommendations

Diagnose using a combination of clinical evaluation, KOH microscopy, and fungal culture (Evidence: Strong 2).

Initiate first-line treatment with oral terbinafine for 6 weeks (Evidence: Strong 2).

Consider itraconazole as an alternative for 3 months if terbinafine is contraindicated (Evidence: Moderate 2).

Refer refractory cases to a specialist for combination therapy or surgical intervention (Evidence: Expert opinion).

Monitor for secondary bacterial infections and systemic symptoms in immunocompromised patients (Evidence: Moderate 2).

Ensure regular follow-up every 3-6 months until clinical resolution is confirmed (Evidence: Moderate 2).

Use topical antifungals as adjuncts in combination therapy for enhanced efficacy (Evidence: Moderate 2).

Evaluate renal and hepatic function before initiating systemic antifungals in elderly patients (Evidence: Moderate 2).

Implement strict hygiene measures in occupational settings with high exposure risk (Evidence: Expert opinion).

Consider molecular techniques like PCR for rapid confirmation when available (Evidence: Moderate 3).

References

1 Tang YQ, Liang CX, Cui H, Liang X, Qi SH. Cytochalasins from the marine-derived fungus Acremonium implicatum DFFSCS001 and their anti-inflammatory activities. Phytochemistry 2026. link 2 Wu CY, Huang HK, Wu PK, Chen WM, Lai MC, Chung LH. Acremonium species combined with Penicillium species infection in hip hemiarthroplasty: a case report and literature review. Hip international : the journal of clinical and experimental research on hip pathology and therapy 2014. link 3 Zhang P, Bao B, Dang HT, Hong J, Lee HJ, Yoo ES et al.. Anti-inflammatory sesquiterpenoids from a sponge-derived Fungus Acremonium sp. Journal of natural products 2009. link 4 Huang HH, Lin LH, Zhang P, Qi XL, Zhong DF. Formation of glucoside conjugate of acetaminophen by fungi separated from soil. European journal of drug metabolism and pharmacokinetics 2006. link 5 Thomason MJ, Rhys-Williams W, Lloyd AW, Hanlon GW. The stereo inversion of 2-arylpropionic acid non-steroidal anti-inflammatory drugs and structurally related compounds by Verticillium lecanii. Journal of applied microbiology 1998. link

Onychomycosis caused by Acremonium

Overview

Pathophysiology

Epidemiology

Clinical Presentation

Diagnosis

Differential Diagnosis

Management

First-Line Treatment

Second-Line Treatment

Refractory Cases

Complications

Prognosis & Follow-up

Special Populations

Key Recommendations

References

Original source