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Abstract
To the Editor: A 56-year-old Chinese man was referred to Peking Union Medical College Hospital because of polydipsia (9000 ml/24 h) and polyuria (7000 ml/24 h) for over 20 days accompanied with intermittent moderate headache in frontal and temporal areas of both sides for about 2 weeks. The MRI signal feature was hypo- to iso-intense on T1-weighted images (T1WI) with rim enhancement and iso- to hyper-intense on T2-weighted images (T2WI) [Figure 1]. [...]hyperintense signal of pituitary posterior lobe on T1WI was not detected with consistence to the typical MRI signal of central DI. During the procedure, yellowish-white mucous content was seen and drained out. [...]white cystic wall was piecemeal resected. Pituitary abscess is rare and usually causes severe DI, hypopituitarism, and headache,[4] whereas the hormone levels were normal in our patient. [...]infected RCC is a preferred diagnosis which explains both aberrant MRI changes and normal endocrine results. [...]infected RCC is...