noun
lung parenchyma; lung substance
Medical term referring to the functional tissue of the lungs, as opposed to the airways or blood vessels.
肺実質の線維化が進行すると、呼吸が困難になる。
When fibrosis of the lung parenchyma progresses, breathing becomes difficult.
CT画像で肺実質に異常陰影が認められた。
Abnormal shadows were observed in the lung parenchyma on the CT image.
実質 means 'substance' or 'parenchyma' in a biological context; 肺実質 is a compound specifying the lung.
Compound of 肺 (lung) and 実質 (parenchyma/substance), a direct medical term likely calqued from Western anatomy.