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Vascularization of the proximal nail fold. (A) Single-row capillaries in RA patient; (B) multirow capillaries in AS patient; (C) microhemorrhagic dots in AS patient; (D) megacapillary (red arrow), coiled and tortuous capillaries (white arrow) and multirow capillaries in AS patient (black arrow). AS = ankylosing spondylitis, RA = rheumatoid arthritis.
