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However, the cytologic diagnosis of perigastric SFT can be challenging due its rarity with only one cytology case report. Another confounding factor is its potential mimicry with other perigastric\/gastric mesenchymal tumors. Herein, we report a case of perigastric SFT diagnosed on cytology in conjunction with immunohistochemical stains. The patient is a 79\u2010year\u2010old woman who presented with an enlarging perigastric mass on computerized tomography scan which was highly concerning for a saccular aneurysm. Endoscopic ultrasound (EUS) revealed a 6.6 cm hypoechoic lesion abutting the stomach. An EUS\u2010guided fine needle aspiration was performed. The smears showed singly scattered to clusters of bland spindle cells with scant cytoplasm dispersed in a bloody background. The cell block showed similar spindle cells focally supported by a collagenized stroma. Immunohistochemical stains performed on the cell block showed the tumor cells were positive for CD34, BCL2, and STAT6 and negative for CD117, DOG1, CD31, ERG\u2010ENDO, AE1\/AE3, S\u2010100, desmin, and synaptophysin, supporting the diagnosis of solitary fibrous tumor.<\/jats:p>","DOI":"10.1002\/dc.24544","type":"journal-article","created":{"date-parts":[[2020,7,6]],"date-time":"2020-07-06T14:16:50Z","timestamp":1594045010000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Perigastric solitary fibrous tumor (<scp>SFT<\/scp>) diagnosed on fine needle aspiration: A case report and review of literature"],"prefix":"10.1002","volume":"48","author":[{"given":"Emad","family":"Ababneh","sequence":"first","affiliation":[{"name":"Cleveland Clinic  Cleveland Ohio USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0375-1964","authenticated-orcid":false,"given":"Maria Luisa 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