Co-Occurrence of Pallister-Killian Syndrome and Burkitt Lymphoma in a Patient with Near-Normal Neurocognitive Development

Background: Pallister-Killian syndrome (PKS) is typically recognized by its features that include developmental delay, seizures, sparse temporal hair, and facial dysmorphisms. PKS is most frequently caused by mosaic supernumerary isochromosome 12p. Case Presentation: Here, we report a patient with PKS who was subsequently diagnosed with Burkitt lymphoma. Following the successful treatment of lymphoma, this patient demonstrated very mild intellectual disability despite the diagnosis of PKS, which is usually associated with severe developmental delay. Discussion: This is the first reported patient with PKS and a hematologic malignancy. Although there is no significant reported association of tetrasomy 12p with cancer, the co-occurrence of two rare findings in this patient suggests a potential relationship. The localization of AICDA, a gene for which overexpression has been implicated in promoting t(8;14) noted in our patient's lymphoma, raises a potential mechanism of pathogenesis. In addition, this case indicates that children with PKS can demonstrate near-normal cognitive development.