Abstract
Introduction: solitary fibrous tumors (sFts) are exceedingly rare tumors arising from the submesothelial mesenchymal layer. case report: A case of a 60-year-old male with paranoid schizophrenia presented with acute gastric obstruction secondary to a large, obstructive, mobile mass. surgical exploration revealed a 17x15x10.5 cm extraluminal, pedunculated mass originating from the lesser omentum extrinsically compressing the gastric antrum and duodenum. the mass was surgically resected with immediate relief of patient symptoms. Pathology revealed a spindle cell sarcoma with a high mitotic index. Immunohistochemical analysis was positive for cD34 and a newly elucidated nuclear marker that is sensitive and specific for sFt, stAt 6, was used to confirm the diagnosis of sFt. conclusion: to our knowledge, this is the largest described solitary fibrous tumor arising from the lesser omentum.
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