Unmasking a High-Grade Malignant Neoplasm: A Rare Case of Small Bowel Melanoma

Malignant melanoma of the small bowel is a rare form of gastrointestinal malignancy. This case report describes a 70-year-old woman who presented with symptomatic iron deficiency anemia, progressive abdominal pain, weight loss, and other nonspecific symptoms, prompting an extensive diagnostic workup. Initial endoscopic evaluations were unremarkable, leading to further investigations, including capsule endoscopy and radiologic studies, which identified a jejunal mass. Histopathological and immunohistochemical analyses confirmed the diagnosis of malignant melanoma, and molecular testing identified a BRAF V600 mutation. The patient subsequently underwent surgical resection. This case highlights the diagnostic challenges of small bowel melanoma and the importance of comprehensive clinical, histopathological, and molecular evaluation in establishing the diagnosis. Given the aggressive nature of this malignancy, early diagnosis and timely intervention are essential for improving patient outcomes.