Ultrasound of posterior thorax/lung area?

All tutorials I've come across teach that to scan lungs and pleura you only need to scan anterior & lateral thorax wall, each made up of 4 segments (sup ant/lat & inf ant/lat).

It doesn't quite make sense to me eg when looking for consolidation which might be localized to just one segment. And I've seen case reports of findings on posterior thorax.

Can anyone enligthen me about the truth here?

Authored By Davíð Þórisson on Tuesday 13th November 2012