splenulus

ac·ces·so·ry spleen

[TA]
one of the small globular masses of splenic tissue occasionally found in the region of the spleen, in one of the peritoneal folds or elsewhere.
Farlex Partner Medical Dictionary © Farlex 2012

splenulus

, splenunculus (splĕn′ū-lŭs) [L., a little spleen]
A rudimentary or accessory spleen.
Medical Dictionary, © 2009 Farlex and Partners