Fig. 4.

(A) After fluoroscopy-guided air enema reduction of ileocolic intussusception in a 10-year-old boy, a residual filling defect is shown in the right lower quadrant (arrow). Ultrasonography was subsequently performed to differetiate between incomplete reduction, a pathologic lead point, and pseudomass due to edematous ileocecal valve. Ultrasonography revealed a hypoechoic polypoid mass in the cecum (B) with increased internal vascularity (C). The mass was surgically confirmed as diffuse large B cell lymphoma.