Larger Peripherally
Tend to be Rectangular Peripherally
Paucity or Less Well Formed Posteriorly 

Varied Sizes and Shapes in the Periphery and Centrally Least Prominent Posteriorly
Axial CT in a patient with CHF demonstrates the heterogeneous morphology of the secondary lobule. In this patient the lobules in the periphery are larger than the centrally placed secondary lobules. In addition the peripheral lobules are more rectangular and those centrally are more of a polyhedral shape.
Ashley Davidoff MD TheCommonVein.net 135831