Tc-99m Labeled RBC Scintigraphy of an Inflammatory Pseudotumor of the Spleen

Abstract

Inflammatory pseudotumors are very rare benign lesions of an unknown etiology usually discovered accidentally. We present a 26-year-old woman with a nodal lesion discovered in the spleen during a routine check-up by abdominal ultrasound. Radiocolloid and delayed Tc-99m RBC scintigraphy proved the existence of a delineated hypervascular lesion. Histology and immunohistochemistry of the lesion proved an inflammatory pseudotumor, with very dilated sinusoids with blood congestion. The exact diagnosis of inflammatory pseudotumor can be established only by histology and/or immunohistochemistry of the spleen.