An MNRAS preprint on ArXiv today (https://arxiv.org/abs/2402.05855) describes the discovery of a nova super-remnant (NSR) cavity surrounding RS Ophiuchi. The team from Liverpool John Moores and Royal Observatory Edinburgh used archival FIR images from IRAS.
An NSR is a vast extended shell surrounding a recurrent nova (RN) formed by the cumulative effect of eruptions sweeping up local interstellar medium. It is speculated that all RNe should result in an NSR, but the only other one confirmed so far is that associated with M31N 2008-12a, in the Andromeda Galaxy, which is the most frequently erupting RN.