ACTA1 and gastrointestinal stromal tumor: Endoscopic ultrasound‐guided fine‐needle aspiration revealed spindle‐cell proliferation with minimal atypia; immunohistochemistry was strongly positive for smooth‐muscle markers (α‐SMA, desmin), favoring leiomyoma; however, weak c‐kit/DOG1 staining meant gastrointestinal stromal tumor (GIST) could not be excluded.