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  • Title: An Overview of Diagnosis of Primary Autoimmune Hypophysitis in a Prospective Single-Center Experience.
    Author: Chiloiro S, Tartaglione T, Angelini F, Bianchi A, Arena V, Giampietro A, Mormando M, Sciandra M, Laino ME, De Marinis L.
    Journal: Neuroendocrinology; 2017; 104(3):280-290. PubMed ID: 27165294.
    Abstract:
    BACKGROUND: Autoimmune hypophysitis is a rare disease with a natural progression that is not well known. AIM: To collect representative data on clinical features of autoimmune hypophysitis and better characterize the disease. PATIENTS AND METHODS: A prospective single-center study was designed. Autoimmune hypophysitis-affected patients evaluated from 2011 at our tertiary care Pituitary Unit were enrolled. After ruling out other pituitary masses and secondary causes of hypophysitis, autoimmune hypophysitis was the diagnosis of exclusion. Autoimmune hypophysitis was classified as adenohypophysitis, panhypophysitis, and infundibuloneurohypophysitis according to clinical and neuroradiological findings. RESULTS: A total of 21 patients met the inclusion criteria: 9 were diagnosed with adenohypophysitis, 4 with panhypophysitis, and 8 with infundibuloneurohypophysitis. The frequency of secondary hypoadrenalism was similar in adenohypophysitis, panhypophysitis, and infundibuloneurohypophysitis. Growth hormone deficit and secondary hypogonadism occurred more frequently in infundibuloneurohypophysitis than in adenohypophysitis and panhypophysitis (p = 0.009; p = 0.04). All cases of multiple pituitary secretion deficits occurred in cases of infundibuloneurohypophysitis (p = 0.04). No correlations between hypophysitis subtype and anti-pituitary and anti-hypothalamus autoantibodies were found. A higher frequency of extractable nuclear antigens (ENA) and anti-nuclear antibodies (ANA) was found in cases of panhypophysitis (OR 5.0, 95% CI 0.86-28.8, p < 0.001, and OR 1.8, 95% CI 1.1-3.2, p = 0.02, respectively) as compared to adenohypophysitis and infundibuloneurohypophysitis. CONCLUSION: Infundibuloneurohypophysitis should be taken into account in the etiological diagnosis of hypopituitarism, particularly if it is associated with diabetes insipidus and in cases of growth hormone deficit, secondary hypogonadism, or multiple hormone deficits. Contrast-enhanced MRI is crucial for the clinical and noninvasive diagnosis of hypophysitis. Screening for autoantibodies, particularly anti-ENA and anti-ANA, is strongly suggested in the clinical context of hypophysitis.
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