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Fig. 1B. Anatomic drawings of spleen. Locations of axial
(A), coronal (B), and sagittal (C) accessory
spleens are derived by dividing left upper quadrant into discrete anatomic
compartments. This was done by drawing line perpendicular to longest axis of
main spleen at level of spenic hilum, resulting in anteromedial (AM),
anterolateral (AL), posteromedial (PM), and posterolateral (PL) compartments.
Craniocaudally, main spleen was divided into superior third, middle third, and
inferior third. When accessory spleen was located anterior (A) to or posterior
(P) to main spleen, area was again divided into superior third, middle third,
and inferior third. Accessory spleens outside this region were considered
either superior (S) to or inferior (I) to main spleen.