Ectopic pituitary neuroendocrine tumor arising in the sphenoid sinus with an avid 18F-fluorodeoxyglucose uptake masquerading as malignancy: A case report by Yukiko Usui, MD, Ryo Kurokawa, MD, PhD, Takahiro Fukushima, MD, Richi Fujita, MD, Reina Hosoi, MD, Emi Miyawaki, MD, Michio Hayashi, MD, Sadahiro Kishisita, MD, Mariko Kurokawa, MD, Osamu Abe, MD, PhD, Haruyasu Yamada, MD, PhD

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