Fig. 4

Surgery and histological evaluation of the surgical specimens. A Image showing debridement of the right lower extremity with a sinus tract (black arrow). B Pathological findings showing a lumen-like structure formed from the specimen of the sinus tract (red arrow, hematoxylin and eosin, 40×, scale bar: 250 µM). C Pathological findings showing granulomatous inflammatory lesions (green circle, hematoxylin and eosin, 40×, scale bar: 250 µM)