Abstract
Solitary fibrous tumors are mesenchymal fibroblastic tumors that were originally described as intrathoracic lesions but have since been found to occur in many other locations. They may rarely occur as paratesticular masses. Here we present a peculiar case of a solitary fibrous tumor arising in the paratesticular region and exhibiting leiomyoma-like morphology. Confirmation of the tumor as a solitary fibrous tumor was achieved by RNA sequencing showing NAB2::STAT6 fusion. Possible explanations for the unusual tumor morphology include entrapment of normal smooth muscle elements and tumor differentiation into smooth muscle type cells.
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