Fig. 4

Correlation between endoscopic and histopathologic characteristics in inflammatory submucosal tumors -like lesions. A1-2: A lesion misdiagnosed as a rectal neuroendocrine tumor, presenting as a submucosal mass with mixed echogenicity and a heterogeneous echotexture on EUS. A3-4: Hematoxylin and Eosin (HE) staining reveals diffuse inflammatory cell infiltration, fibrous tissue proliferation (black arrow), and inflammatory granulation tissue (blue arrow). B1-2: A collagenous nodule in the transverse colon, presenting as a submucosal arcuate hyperechoic band with posterior acoustic shadowing on EUS. B3-4: HE staining reveals collagen fiber proliferation, forming a dense, mesh-like structure with nodular formations