Fig. 2

A 45-year-old male patient with inflammatory pseudotumor-like follicular dendritic cell sarcoma of the spleen. a Plain computed tomography scan showing a round slightly hypodense lesion of the spleen. There was homogeneous density and, no obvious signs of necrosis, calcification, or bleeding. b and c After contrast enhancement, the relatively hypodense lesion is observed in all phases. d Circular enhancement at the lesion’s edge in the delayed phase. e Ultrasound image, revealing a round-like lesion with a clear boundary and homogeneous hypoechogenicity in the spleen. f Pathological examination of the lesion (hematoxylin and eosin [HE], ×100). A large number of inflammatory cells infiltrate the tumor (black star). The formation of a fibrous pseudocapsule (white arrow) with blood vessels (black arrow) in the fibrous capsule can be seen at the edge of the tumor