Extraosseous Uptake and Multiple Metastases of Splenic Composite Hemangioendothelioma on ^99mTc-MDP Scintigraphy

Composite hemangioendothelioma is a rare disease that exhibits biological potency ranging from benign to low-grade malignancy, and hepatic and bone metastases are even rarer. Here, we present the imaging findings of a 65-year-old man with splenic composite hemangioendothelioma and multiple metastases. A bone scan revealed abnormal uptake of Tc-99m-MDP in multiple bones and spleen, whereas enhanced CT demonstrated splenic lesions with low density and mild enhancement. Based on pathological examination, the patient was diagnosed with splenic composite hemangioendothelioma with bone metastasis.