Fig. 4
From: Tertiary lymphoid organs in the inflammatory myopathy associated with PD-1 inhibitors
a-c Some inflammatory cells in three cases of PD1 myopathy show affinity to anti-CD21 antibody. Many of them are spindle-shaped, elongated and form ill-defined chains with occasional arborization. (arrowheads). d Positive cell was not seen in PM1. e In PM2, only a few spindle-shaped positive cells (arrowhead) were seen. f A case of JDM showed foci of inflammatory cells with positivity