noun, noun or participle which takes 'suru', noun which may take the genitive case particle 'no'
regression; involution; atrophy
Medical term for the shrinking or regression of tissue, organs, or tumors. Used in clinical contexts.
治療により腫瘍の退縮が認められた。
Regression of the tumor was observed after treatment.
加齢に伴う胸腺の退縮は自然な現象だ。
Involution of the thymus with age is a natural phenomenon.