POTENTIAL FALSE-POSITIVE RED-BLOOD-CELL GASTROINTESTINAL-BLEEDING STUDY SECONDARY TO OSSEOUS METASTASIS

The authors present a case of a large osseous metastasis in the right hemipelvis that initially simulated a gastrointestinal bleeding site. Delayed imaging demonstrated a lack of interval change and failure of progression of the scintigraphic abnormality, suggesting an alternative etiology. Radiographs of the pelvis and a superior mesenteric angiogram confirmed the presence of a hypervascular metastasis of the right iliac wing secondary to nonsmall cell lung carcinoma. Correlation with radiographs of the abdomen may be helpful for evaluating gastrointestinal bleeding scans with atypical findings.