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Pseudomembranous conjunctivitis following bone marrow transplantation: immunopathological and ultrastructural study
Abstract:
Pseudomembranous conjunctivitis (PMC) is a rare ophthalmic lesion usually caused by infectious agents such as streptococcus, Klebsiella, Chlamydia, or adenovirus. It can also be associated with skin lesions of toxic epidermal necrolysis (TEN) and graft-versus-host-disease (GVHD). We report the pathological study of a patient with PMC and GVHD who had a conjunctival biopsy before death. This allowed us to differentiate this form of PMC from PMC of infectious origin, and to find within the epithelium characteristic features of acute GVHD and mononuclear cells expressing natural-killer markers. This suggests that this form of PMC resulted from a very acute, cytotoxic form of GVHD. Because PMC in bone marrow recipients can be related to infections, TEN, or acute GVHD, a systematic pathological study is required to guide the therapy.
Insights
Pseudomembranous conjunctivitis (PMC) can stem from infections or graft-versus-host-disease (GVHD). Pathological study of a PMC patient revealed acute GVHD, not infection, guiding therapy for bone marrow recipients.
Area of Science:
- Ophthalmology
- Pathology
- Immunology
Background:
- Pseudomembranous conjunctivitis (PMC) is a rare condition often linked to infections but also associated with toxic epidermal necrolysis (TEN) and graft-versus-host-disease (GVHD).
- Distinguishing the cause of PMC is crucial for appropriate treatment, especially in bone marrow transplant recipients where multiple etiologies are possible.
Observation:
- A case study involving a patient with PMC and GVHD underwent a conjunctival biopsy for pathological examination.
- The biopsy was performed prior to the patient's death, providing a unique opportunity for detailed analysis.
Findings:
- Pathological findings differentiated this PMC from infectious causes, revealing characteristic features of acute GVHD within the conjunctival epithelium.
- Mononuclear cells expressing natural-killer markers were identified, supporting a diagnosis of acute, cytotoxic GVHD as the cause of PMC.
- The study highlights the importance of pathological examination in identifying the specific cause of PMC in complex cases.
Implications:
- This research suggests that PMC in bone marrow recipients can manifest as a direct result of acute GVHD, not solely infections or TEN.
- A systematic pathological approach is essential for accurate diagnosis and to guide targeted therapeutic strategies for PMC.
- Understanding the specific etiology of PMC (infectious vs. GVHD) is critical for optimizing patient management and outcomes.