Splenosis refers to autotransplantation of splenic tissue following splenic trauma or splenectomy. After rupture, splenic fragments may implant throughout the peritoneal cavity and vascularize, forming multiple nodules of functional splenic tissue. Splenosis is typically asymptomatic and discovered incidentally on imaging.

Splenule (A) is a congenital accessory spleen, not related to trauma.

Hamartoma (C) is a benign primary splenic lesion.

Target lesion (D) generally refers to sonographic appearance seen in metastases or infections, not post-trauma.

Reference Extracts:

Mortelé KJ, et al. "Multimodality imaging of splenic lesions and the spleen." Radiographics. 2004;24(4):1137-1163.

Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.

—