MEF2C and neoplasm: Based on publications of a new entity, available only from 2019 on [1], the diagnosis of MSA with local recurrence and pulmonary metastases was retrospectively rendered, based on typical histology and immunohistology, and on proof of a tumor-specific MEF2C::SS18 gene fusion in reverse transcription polymerase chain reaction (RT-PCR) and fluorescence in situ hybridization (FISH) analysis of both the primary tumor and lung metastasis.