Fig. 4From: Pathologically confirmed spontaneous regression of small cell lung cancer after computed tomography-guided percutaneous transthoracic needle biopsy followed by surgeryPathological findings of the resected specimens (HE stain, low-power field). Pathological findings revealed an active fibrosis (arrows) and lymphocyte infiltration (dotted line) around the tiny lung cancer lesion (arrowheads)Back to article page