Mutation-Negative Lynch Syndrome

**Semantic type:** Finding

**Definition:** A finding of Lynch syndrome in which one is identified as having a "non-sporadic" DNA mismatch repair (MMR) deficient premalignant lesion or "non-sporadic" MMR deficient malignant tumor, but germline MMR genetic testing did not demonstrate a recognized pathogenic mutation in the genes responsible for DNA mismatch repair.

**Synonyms:** - Lynch-Like Syndrome - Lynch-Like Syndrome