Retroperitoneal Capillary Hemangioma Mimicking Paraganglioma on 18 F-AlF-NOTA-Octreotide PET/CT.

Capillary hemangiomas are commonly encountered superficially in the cutaneous, subcutaneous, or mucosal tissues during childhood and early adulthood, but retroperitoneal capillary hemangioma is a rare occurrence. We present a case of a 61-year-old woman with incidentally detected capillary hemangioma in the retroperitoneum initially presumed to be paraganglioma based on 18 F-AlF-NOTA-Octreotide PET/CT findings. Contrast-enhanced MRI revealed a hypervascular mass in the retroperitoneum. 18 F-AlF-NOTA-Octreotide PET/CT performed for suspicion of paraganglioma showed intense uptake. Histopathologic examination of the retroperitoneal mass after surgical resection confirmed the diagnosis of capillary hemangioma rather than paraganglioma.