Abstract
Invasive lobular carcinoma (ILC) is the second most prevalent form of invasive breast cancer. Characterized by its insidious growth and distinctive histopathological features, ILC often presents with a less predictable metastatic pattern, including potential invasion of the gastrointestinal tract. This report presents the case of a patient with ILC who developed ileocecal valve metastasis leading to cecal volvulus, a rare but critical complication. The slow dissemination of ILC delayed the diagnosis and allowed for significant tumor burden at the ileocecal junction with consequent intestinal occlusion, resulting in acute abdominal symptoms and the need for surgical intervention. Treatment strategies for ILC, which may include surgery, radiation, and systemic therapies, vary based on the tumor's stage and hormonal receptor status. In this particular case, the patient underwent an emergent right hemicolectomy with subsequent treatment with fulvestrant. This case highlights the importance of vigilant monitoring for unusual metastatic sites in ILC and underscores the need for comprehensive treatment approaches tailored to individual patient profiles.