Inflammatory myofibroblastic tumor of omentum mimicking an ovarian lesion: A case report.

Inflammatory myofibroblastic tumor (IMFT) is a neoplastic entity with intermediate malignant potential, characterized by its tendency for local recurrence and, rarely, distant metastasis. It most often occurs in the lung, while extra-pulmonary sites, like the omentum, are rare and present with non-specific clinical and radiologic features, making diagnosis challenging. A 6-year-old girl presented with a 2-month history of intermittent fever, a painless abdominal lump, elevated inflammatory markers, and an ultrasound impression suggestive of an ovarian neoplasm, while magnetic resonance imaging (MRI) showed a right iliac fossa mass separate from the ovary with persistent enhancement. Laparoscopic resection identified the lesion arising from the greater omentum, and histopathology with immunohistochemistry confirmed the diagnosis of IMFT. Omental IMFT is rare and often mimics ovarian or other intra-abdominal tumors, making multimodality imaging, particularly magnetic resonance imaging, crucial for lesion localization and narrowing the differential diagnosis. Although histopathology confirms the diagnosis and complete surgical resection typically yields excellent outcomes, long-term follow-up remains essential due to the risk of recurrence.