noun which may take the genitive case particle 'no'
interstitial
Medical term used to describe something relating to or situated in the interstices (spaces) within a tissue or organ. Commonly appears in compound terms like 間質性肺炎 (interstitial pneumonia).
Interstitial pneumonia is a disease in which inflammation occurs in the interstitium of the lungs.
Interstitial changes are observed in this patient.
Compound of 間質 (interstitium, from 間 'interval' + 質 'substance') + 性 (-ness, nature). A medical term likely coined in Japanese from kanji elements.