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Gastrointestinal stromal tumors (GIST) are sub epithelial soft tissue neoplasms in the gastrointestinal tract. Extragastrointestinal stromal tumors (E-GISTs) are rare, comprising 5%-7% of GISTs. A case of a 65-year-old female with abdominal bloating, heaviness, and constipation is reported. Magnetic resonance imaging revealed a mass in the ischioanal region, initially thought to be a solitary fibrous tumor. The mass was completely excised, and pathological examination confirmed it as a C-Kit Negative E-GIST. This case highlights the rarity and uniqueness of the ischioanal mass detected through pelvic MRI.