Which area of the spleen is not covered by visceral peritoneum?

The spleen is almost entirely covered by visceral peritoneum, except at the hilum where vessels, nerves, and lymphatics enter and exit. This area lacks peritoneal covering to allow vascular connection to the splenic artery and vein.

According to Moore’s Clinically Oriented Anatomy:

“The spleen is entirely covered by visceral peritoneum except at its hilum where the vascular structures enter.”