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Mucormycosis in a transplant recipient
Abstract:
Mucormycosis classically occurs in patients who have uncontrolled diabetes who develop rhinocerebral disease. A fatal case of rhinocerebral infection caused by Rhizopus arrhizus in a 53-year-old man who had received a renal homograft three years previously is reported. Only five similar cases have been documented, all since 1970. Although direct smears of the purulent nasal exudate revealed the presence of numerous Gram-negative bacilli, later identified as Haemophilus influenzae, the diagnosis of mucormycosis was made by demonstrating the typical broad, nonseptate branched hyphae in the necrotic tissue obtained by surgical debridement of the paranasal sinuses. Culture of this material revealed growth of mold-like fungus which, upon direct microscopic examination, showed sporangiophores bearing spherical sporangia arising directly from a cluster of root-like structures of rhizoids. Despite the immediate institution of therapy with amphotericin B postoperatively, the patient died 48 hours later. Subsequently, the Rhizopus isolated was shown to be resistant to both amphotericin B and 5-fluorocytosine. The present case and two others stress the importance of an aggressive diagnostic approach to patients suspected of having mucormycosis, because the usual microbiologic technics are frequently, inexplicably, unsuccessful, and possibly even misleading in this disease.
Insights
This case report details a fatal rhinocerebral mucormycosis infection in a renal transplant patient caused by Rhizopus arrhizus. Aggressive diagnostics are crucial as standard methods may be misleading.
Area of Science:
- Mycology
- Infectious Diseases
- Nephrology
Background:
- Mucormycosis is a severe fungal infection often seen in immunocompromised individuals, particularly those with uncontrolled diabetes.
- Rhinocerebral mucormycosis is a rare but life-threatening manifestation.
Observation:
- A fatal case of rhinocerebral mucormycosis caused by Rhizopus arrhizus in a 53-year-old male renal transplant recipient is presented.
- Initial diagnostic smears showed Haemophilus influenzae, potentially misdirecting the diagnosis.
- Broad, nonseptate hyphae in necrotic tissue confirmed mucormycosis.
Findings:
- The isolated Rhizopus strain demonstrated resistance to amphotericin B and 5-fluorocytosine.
- Standard microbiological techniques were insufficient for timely and accurate diagnosis.
Implications:
- This case underscores the need for a high index of suspicion and aggressive diagnostic strategies for mucormycosis in transplant recipients.
- Early and accurate diagnosis is critical for effective management, despite potential challenges with conventional methods.