Acute interstitial nephritis refers to a severe inflammation of the kidneys, particularly the interstitial tissues. While it may be challenging to find direct synonyms for this medical condition, it can be helpful to understand terms associated with it. One related term is "acute tubulointerstitial nephritis", which refers to the same condition with an emphasis on the tubules' involvement. Other synonyms such as "acute interstitial renal disease" or "acute interstitial kidney inflammation" can be used to describe this disorder to some extent, highlighting the inflammation and kidney involvement. Note that the accuracy and specificity of such synonyms may vary within medical contexts, so consulting a healthcare professional is always recommended for precise understanding and communication.