Widespread peritoneal splenosis following splenic rupture and splenectomy
Splenectomy following rupture in motor vehicle accident 20 years prior to the first scan. CT scan for unrelated reasons.
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Scan in 2016 for renal calculi, noted multiple rounded mass lesion in peritoneal fat. Review of CT in 2008 with IV contrast shows a similar appearance with uniformly enhancing rounded masses. Absent spleen due to splenectomy for trauma many years ago.
The presence of splenic tissue outside the spleen can be due to 2 causes, either an accessory spleen (splenunculi) or splenosis whereby small fragments of spleen that break off the organ (usually due to trauma) can implant and gain a blood supply acting as small independent spleens. This is said to be surpringly common (65% of traumatic splenic rupture)!