“…In particular, the left upper abdomen has two locations that need further surgical considerations: the lesser sac and the spleen. 3 The lesser sac is a natural space, a 'box', limited dorsally by the body and tail of the pancreas, and caudally by the transversa mesocolon, where the middle colic artery runs. Ventrally, the greater omentum will cover this box, together with the posterior side of the stomach.…”