title: Postoperative retroperitoneal desmoid tumor mimics recurrent gastrointestinal stromal tumor: a case report.
abstract: Desmoid tumor is a locally invasive, myofibroblastic, nonmetastatic tumor. Its pathogenesis remains unclear and it may involve genetic abnormalities, sex hormones and traumatic injury, including surgery. Postoperative intra-abdominal desmoid tumor is rare, especially in the retroperitoneum. We report a case of postoperative retroperitoneal desmoid tumor that developed 29 mo after the first excision of a gastrointestinal stromal tumor. Sporadic trauma-related intra-abdominal desmoid tumors reported in the English literature are also reviewed. Despite an extremely low incidence, postoperative desmoid tumor should be considered in the differential diagnosis when a recurrent neoplasm is found at least one year after operation. However, it is a clinical challenge to distinguish recurrent malignant neoplasms from desmoid tumors, and surgical resection is the treatment option depending on the anatomic location.
authors.affiliation: Department of Anatomic Pathology, Buddhist Dalin Tzu Chi General Hospital, Chiayi 62247, Taiwan.
authors.forename: Liang-Yu
authors.initials: LY
authors.lastname: Shih
authors.forename: Chang-Kuo
authors.initials: CK
authors.lastname: Wei
authors.forename: Chih-Wen
authors.initials: CW
authors.lastname: Lin
authors.forename: Chih-En
authors.initials: CE
authors.lastname: Tseng
mesh_terms: D001706:Biopsy; D003937:Diagnosis, Differential; D013505:Digestive System Surgical Procedures / Q000009:adverse effects*; D018222:Desmoid Tumors / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D046152:Gastrointestinal Stromal Tumors / Q000556:secondary / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000473:pathology*; D016609:Neoplasms, Second Primary / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D011237:Predictive Value of Tests; D012186:Retroperitoneal Neoplasms / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome