Multiple cutaneous leiomyomas leading to discovery of novel splice mutation in the fumarate hydratase gene associated with HLRCC.

Hereditary leiomyomatosis and renal cell cancer (HLRCC) is a rare autosomal dominant condition, which manifests as cutaneous leiomyomas (CL), uterine fibroids and renal cell cancer (RCC). We describe the case of a 53-year-old woman who presented with multiple CL with a novel heterozygous canonical splice site mutation in intron 9 of the fumarate hydratase (FH) gene IVS 9-1 G>C (NM_000143.3:c 1391-1 G>C) that was not detected on initial screening of a mutation hotspot but was picked up on sequencing the remaining exons and splice site junctions. This report highlights the importance of clinical suspicion in the diagnosis of HLRCC in the absence of a family or personal history of cancer and despite initial genetic testing being negative.