Diphenylhydantoin-induced hypersensitivity reaction with interstitial nephritis

Area of Science:

• Pediatric Nephrology
• Clinical Immunology
• Dermatology

Background:

• Drug-induced hypersensitivity reactions can manifest with diverse systemic symptoms.
• Diphenylhydantoin (DPH) is known to cause various adverse effects, including dermatological and hepatic complications.
• Renal involvement in DPH hypersensitivity is less commonly described but can be severe.

Observation:

• A 10-year-old girl presented with exfoliative dermatitis, lymphadenopathy, hepatitis, eosinophilia, and transient renal failure following DPH administration.
• Clinical presentation suggested a severe hypersensitivity reaction to DPH.
• Renal biopsy revealed multinucleated histiocytes in the interstitium without immune reactant deposition on immunofluorescence.

Findings:

• Specific lymphocyte sensitization to DPH confirmed a delayed hypersensitivity response.
• The pattern of renal injury, characterized by interstitial infiltrates and absence of immune deposits, points towards a cell-mediated mechanism.
• This suggests that DPH-induced renal failure in this case was primarily immune-mediated via T-cell activation.

Implications:

• This case highlights the potential for DPH to induce severe, cell-mediated renal injury in children.
• Understanding the immunologic basis of DPH toxicity is crucial for accurate diagnosis and management of similar cases.
• Further research into T-cell mediated drug hypersensitivity is warranted to improve patient outcomes and drug safety.