PMC5671415_01
Axial view of the patient's abdomen on magnetic resonance imaging with contrast (A) and Tc-99 heat-damaged autologous red blood cell scan SPECT/CT (B). The adrenal mass (green arrow) and intraperitoneal mass (orange arrow) show uniform uptake of Tc-99 heat-damaged autologous red blood cells, indicating splenic origin.
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MRI showed a solid 4.4 cm mass that appeared to be arising from within the right adrenal gland, and multiple smaller intraperitoneal masses with identical signal characteristics, initially felt to be concerning for a malignancy (Fig. 1A). Splenosis was confirmed by Tc-99m labeled heat-damaged autologous red blood cell SPECT-CT, which showed uniform radiotracer uptake in all nodules (Fig. 1, Fig. 2).