Extra gastrointestinal stromal tumor (EGIST) of the ischioanal space detected on pelvic MRI.

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.