Tumor Within Another Tumor: An Unusual Case of Metastatic Poorly Differentiated Thyroid Carcinoma Within an Intracranial Meningioma

Department of Diabetes and Endocrinology (M.L., T.W., J.R.F.), Bankstown-Lidcombe Hospital, Sydney, New South Wales 2200, Australia; University of New South Wales (M.L., T.W., S.A., J.R.F.), Sydney, New South Wales 2052, Australia; Department of Nuclear Medicine and Ultrasound (C.D.B.), Bankstown-Lidcombe Hospital, Sydney, New South Wales 2200, Australia; Department of Radiology (S.A.), Bankstown-Lidcombe Hospital, Sydney, New South Wales 2200, Australia; Department of Pathology (J.J.L., T.Y.), Liverpool Hospital, Sydney, New South Wales 2170, Australia; and Department of Oncology (S.H.), Bankstown-Lidcombe Hospital, Sydney, New South Wales 2200, Australia