“…In luetic tissues, plasma cell-rich inflammation is characteristic, regardless of the site of biopsy (e.g., tongue [ 18 ], palatine [ 18 ], tonsils [ 11 , 18 ], cervical lymph nodes [ 4 , 8 , 11 , 19 ], lung nodules [ 14 , 16 ], skin [ 16 , 18 ]). Fibrosis is observed in lung nodules [ 14 ] and the periphery of the swollen lymph nodes (“capsular/parcel fibrosis”) [ 8 , 10 , 11 , 19 ]. Perivascular inflammation [ 6 , 8 , 12 , 19 ], occlusion vasculitis [ 8 , 19 ], multinucleated giant cells [ 8 , 19 ], and granuloma formation [ 8 , 10 ] can also be seen in various biopsy samples.…”