case_images: PMC6562339_01
case_images: Dark red, necrotic, slightly tender lesions developed symmetrically on MCP joints and knees.
case_images: fonc-09-00478-g0001.jpg
case_images: PMC6562339_01_fonc-09-00478-g0001.jpg
case_images: F1
case_images: A few days later, skin lesions appeared on the MCP and knees (Figure 1).
case_images: Hematoxylin and eosin (HE) staining shows blood vessels (white areas) with surrounding neutrophilic inflammatory aggregates (arrows), establishing the diagnosis of neutrophilic vasculitis. Picture magnification: 20x; scale bar: 50 mu.
case_images: fonc-09-00478-g0002.jpg
case_images: PMC6562339_01_fonc-09-00478-g0002.jpg
case_images: F2
case_images: Biopsy there showed a neutrophilic vasculitis, as can be seen in cutaneous forms of GPA (Figure 2).