It encompasses variably myxoid entities including acral fibromyxomas, extraskeletal myxoid chondrosarcoma, ganglion cyst with mucus extravasation, ALK + epithelioid cell histiocytoma, ALK-rearranged myxoid dermal neoplasms, ALK-positive fusion-driven rhabdomyosarcoma and other myxoid lesions. This evidence concerns the gene ALK and extraskeletal myxoid chondrosarcoma.