Partial tetrasomy 9 is a very rare chromosome abnormality. Of the reported cases, most have had tetrasomy only of 9p arising from the formation of an isochromosome. In addition, mosaicism was found in five of the 12 previous cases. We report on a case of non-mosaic partial tetrasomy 9 involving all of the short arms and asymmetrical segments of the long arms.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.