Malignant epithelioid neoplasm with GLI1 gene rearrangement (PANX3::GLI1 transcript) and MDM2 gene amplification.
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We hereby report the case of an epithelioid neoplasm arising from pterygopalatine fossa in a 13-year-old child harboring PANX3::GLI1 fusion and MDM2 amplification. Identified chimeric gene can explain observed signs of osteogenic differentiation. We discuss the challenges in differential diagnosis from osteogenic tumors and soft tissue neoplasms with epithelioid morphology. Our case is the first report of a tumor with such genetic abnormalities and it is about to replenish the spectrum of rare GLI1-rearranged tumors.