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A hard swelling located on the top of the skull developed progressively in a 27-year-old woman who had been treated previously for ovarian dysgerminoma. Bone scintigraphy showed an unusual pattern, consisting of a well-circumscribed area of intensely increased uptake that seemed superimposed on the skull. Results of a CT scan were inconclusive. Biopsy of the lesion revealed a benign osseous angioma.