Assertion: mediastinum's boundary | /r/CapableOf | extend beyond costal surface
Facets:
value: at the right lower sternal region
type: LOCATION
Source sentences:
text: The inferior boundary of the parietal pleura mirrors the lower border of the thoracic cage, but may extend beyond the costal surface, specifically at the right lower sternal region and at the posterior junction of ribs and vertebra bilaterally.