Pyoderma Gangrenosum Simulating Necrotizing Fasciitis

Area of Science:

• Dermatology
• Immunology
• Hematology

Background:

• Pyoderma gangrenosum (PG) was historically misattributed to bacterial infection but is now recognized as an autoimmune disorder.
• Necrotizing fasciitis is a severe, rapidly progressing soft tissue infection leading to necrosis.
• The case involves a patient presenting with symptoms initially suggestive of necrotizing fasciitis.

Purpose of the Study:

• To report an unusual case of pyoderma gangrenosum.
• To discuss the differential diagnosis between pyoderma gangrenosum and necrotizing fasciitis.
• To highlight the association between pyoderma gangrenosum and myelodysplastic syndrome.

Main Methods:

• Clinical presentation of a 59-year-old woman with a rapidly evolving ulcerative lesion.
• Diagnostic workup including microbiological and histopathological analyses.
• Treatment with oral prednisone and monitoring of patient outcome.

Main Results:

• Microbiological tests were negative, ruling out bacterial infection.
• Histopathology revealed epidermal necrosis and a neutrophil-rich inflammatory infiltrate.
• The patient achieved complete healing of the pyoderma gangrenosum lesion within two months of treatment.

Conclusions:

• The patient was diagnosed with pyoderma gangrenosum associated with myelodysplastic syndrome.
• Early diagnosis and appropriate treatment with corticosteroids led to successful healing.
• This case underscores the importance of considering pyoderma gangrenosum in the differential diagnosis of rapidly progressing ulcerative lesions, especially in patients with underlying hematological conditions.