Abstract

Constitutional mismatch repair deficiency (CMMRD) syndrome is a rare autosomal recessive genetic disorder that has little more than 200 total cases reported as of 2020. Whereas a single mutation in genes responsible for mismatch repair causes the autosomal dominant Lynch syndrome (LS), CMMRD is caused by biallelic heterozygous defects: distinct deleterious mutations on each allele for a single gene. As the disease is exceedingly rare and may present via a wide variety of signs, including neurofibromatosis type 1- and Lynch Syndrome-associated malignancies, diagnosis and subsequent surveillance are complex with suggested methods published by the International Replication Repair Deficiency Consortium. We report here the history and management of a patient whose newly diagnosed CMMRD was managed with both curative and prophylactic surgical treatment.

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