Imaging findings of primary gastric plasmacytoma:A case report

Primary gastric plasmacytoma(GP)is a rare extramedullary plasmacytoma with clinical and imaging features that are common among other gastric tumors,such as gastric adenocarcinomas,gastric stromal tumors,and lymphomas.Here,we present a histologically confirmed case of primary GP examined with biphasic computed tomography(CT),magnetic resonance imaging(MRI),and endosonography.A well-circumscribed extraluminal mass appearing as homogeneous attenuation/intensity with gradual enhancement was identified on biphasic enhancement CT and MRI.This mass was hyperintense on diffusion-weighted imaging and hypointense on the apparent diffusion coefficient map,implying that water diffusion in the mass was restricted.In addition,endosonography indicated a low echogenic mass in the gastric wall.These imaging findings increase the available knowledge about imaging of this disease and provide valuable information for differentiating primary GP from common gastric tumors.