Signs and Symptoms of Fungal Peritonitis
The clinical presentation of fungal peritonitis is indistinguishable from bacterial peritonitis, typically manifesting as abdominal pain and cloudy peritoneal effluent 1, 2, 3.
Primary Clinical Features
The most common presenting symptoms include:
- Abdominal pain - the predominant symptom across all cases
- Cloudy peritoneal dialysate/effluent - universally present
- Fever - may or may not be present; abdominal pain with fever is actually a risk factor for worse outcomes 3
- Fibrinous debris in dialysate 4
Critical Diagnostic Challenge
There are no pathognomonic signs or symptoms that differentiate fungal from bacterial peritonitis 2, 3. This is a crucial pitfall - clinicians cannot rely on clinical presentation alone to suspect fungal etiology. The diagnosis depends entirely on microbiological identification through cultures 3.
When to Suspect Fungal Peritonitis
You should have heightened suspicion for fungal peritonitis in the following clinical scenarios:
- Refractory peritonitis unresponsive to appropriate antibiotics 5
- Recent bacterial peritonitis (55% of patients had bacterial peritonitis in the preceding 3 months) 1
- Recent exposure to multiple antibiotics (62.5% received ≥2 antibiotic types in prior 3 months; this is independently associated with fungal peritonitis with OR 1.940) 1
- Polymicrobial or enterococcal preceding bacterial infections 1
- Low serum albumin levels 2
- Prolonged antibiotic use 6
- Recent hospitalization 6
Atypical Presentations
While rare, some patients may present with:
- Lower extremity weakness and altered mental status (as seen with Blastomyces peritonitis) 7
- Subtle or nonspecific findings requiring high index of suspicion 7
Laboratory Findings
- Elevated peritoneal white blood cell count
- Elevated C-reactive protein 4
- Positive serum galactomannan antigen test (useful for Aspergillus species) 4
Important Caveats
The absence of candidemia does not rule out intra-abdominal candidiasis - only 6.9% of patients with intra-abdominal candidiasis have concomitant positive blood cultures 8. Additionally, up to 80% of patients with peritonitis are colonized with Candida species, making differentiation between colonization and true infection challenging 8.
The key takeaway: fungal peritonitis presents identically to bacterial peritonitis, so diagnosis requires culture confirmation and high clinical suspicion based on risk factors rather than unique clinical features.