Acute abdomen secondary to perforated jejunal gastrointestinal stromal tumor and imatinib-related isolated pericardial effusion in a 50-year-old female patient: A case report and review of literature.

Introduction: Gastrointestinal stromal tumors (GIST) are the most common mesenchymal tumors of the gastrointestinal tract; occurring most often in the stomach and to a lesser extent in the jejunum. The majority of the tumors express activating mutations in either c-KIT or PDGFRA tyrosine kinases, which respond to tyrosine kinase inhibitors (TKI). Jejunal GIST is considered to be extremely rare and challenging to diagnose due to its non-specific presentation. As a result, patients usually present at an advance stage of the disease, making the prognosis poor and difficult to manage.

Case Presentation: In the present study, we report a 50-year-old female who was diagnosed with metastatic jejunal GIST. She was commenced on Imatinib (TKI) and shortly after she presented to the emergency department with an acute abdomen. A CT scan of the abdomen revealed ischemic changes in the jejunal loops and pneumoperitoneum. The patient required emergency laparotomy due to perforated GIST, and creation of pericardial window due to hemodynamic instability possibly secondary TKI-related isolated pericardial effusion.

Conclusion: Jejunal GIST is rare and usually presents as emergency due to obstruction, hemorrhage or rarely perforation. Although, systemic therapy with TKI is the principal treatment for advance disease, Jejunal GIST should be removed surgically. It is surgically challenging due to the anatomical complexity of the tumor. Surgeons treating such patients must be cautious for TKI side effects.