Annular vasculitis in association with sarcoidosis

Area of Science:

• Dermatology
• Rheumatology
• Immunology

Background:

• Sarcoidosis is a multisystem inflammatory disease characterized by non-caseating granulomas.
• Cutaneous manifestations of sarcoidosis are diverse, but annular vasculitis is uncommon.
• Leukocytoclastic vasculitis involves inflammation of small blood vessels.

Observation:

• A 36-year-old woman with sarcoidosis presented with fever, joint pain, erythema nodosum, and hilar lymphadenopathy.
• She developed distinctive annular, erythematous, and purpuric skin lesions on her thighs and buttocks.
• Skin biopsy confirmed small vessel leukocytoclastic vasculitis.

Findings:

• The patient exhibited a rare association between sarcoidosis and annular cutaneous vasculitis.
• Histopathological examination revealed leukocytoclastic vasculitis in the affected skin lesions.
• Circulating immune complexes were noted, potentially linking early sarcoidosis to vascular damage.

Implications:

• This case highlights an unusual presentation of sarcoidosis, emphasizing the need for comprehensive dermatological evaluation.
• The findings suggest a possible role for immune complex deposition in the pathogenesis of sarcoidosis-associated vasculitis.
• Further research into the immunological mechanisms underlying this association may improve diagnostic and therapeutic strategies.