ACTA ENDOCRINOLOGICA (BUC)

Xanthogranulomas are inflammatory lesions exceptionally rarely occurring in the sellar region. Sellar xanthogranulomas (SXG) result from secondary hemorrhage, infarction, inflammation or necrosis upon existing craniopharyngioma (CP), Rathke`s cleft cyst (RCC) or pituitary adenoma (PA), or represent a stage in xanthomatous hypophysitis evolution. “Pure SXG” are independent of a preexisting lesion. A 70 year old male patient, laryngeal cancer survivor, presented with central diabetes insipidus (CDI). MRI revealed an intra-suprasellar mass of uncertain origin. Transsphenoidal surgery resulted in an efficient lesion resection with maximal pituitary sparing. Pathological report has confirmed SXG without conclusive identification of preexisting sellar lesion. Age at presentation and gender were atypical for SXG. The most frequent presenting signs of SXG were absent. Most SXG are initially misdiagnosed as CP, RCC or PA. Preoperative clinical and radiological uncertainty may impact operative planning. Differentiating from CP is crucial, due to divergent operative target goals and prognosis. Intraoperative frozen section analysis could guide surgical extensiveness. Close collaboration must include endocrinologist, neuroradiologist, neurosurgeon and pathologist. Quantity and quality of provided tissue are essential for avoiding bias in pathohistological analysis of cystic or heterogenous lesions. Awareness is needed of new pathological entities in the sellar-parasellar region. SXG should be considered in differential diagnosis of CDIcausing sellar lesions.

Context. Insulin-like growth factor-1 (IGF-1) is main serum surrogate marker of growth hormone (GH) secretion, used in diagnostics and treatment of GH deficiency (GHD) and acromegaly. Regional, ethnic, racial or nutritional factors obscure cross-population applicability of IGF-1 reference values. Establishment of population- and assayspecific reference values requires sizable representative cohort of healthy subjects. Subjects and Methods. In representative sample of healthy adult population of Serbia (N=1200, 21-80 years, 1:1 male:female) serum IGF-1 was analyzed by Siemens Immulite 2000 assay under uniform laboratory conditions. Upper and lower limit of reference range (5th - 95th percentile) were calculated for each of the 12 quinquennial age intervals. IGF-1 distribution was normalized and standard deviation score (SDS) calculated by Logarithmic and LMS methods. Results. IGF-1 and age correlated significantly, with most prominent decline at 21-50 years, followed by a plateau up to age of 70. Gender differences were not significant overall. Plateau in age-related IGF-1 decline was less prominent in women. Correlations of IGF-1 with body mass index (BMI) or waist to hip ratio (WHR) were insignificant. Superior IGF-1 SDS transformation was achieved with LMS method, while logarithmic method was simpler to use. Conclusions. Normative age-specific serum IGF- 1 reference values were established on a representative cohort of healthy adults in Serbia. Our results support recommendations against necessity for gender-specific or BMI- and WHR-specific reference ranges. Populationbased data serve to generate IGF-1 SDS, which is valuable in rational application of consensus guidelines, proper longitudinal follow-up, advancement in efficacy and safety and personalization of treatment targets.

Introduction. Spontaneous intracranial hypotension (SIH) is defined by reduced CSF pressure without an identifiable cause, hallmarked by acute onset of severe postural headache. Overlapping clinical presentation, MRI appearance, laboratory findings and prevalent risk population, may lead to diagnostic challenges in distinguishing SIH from the more common pituitary adenoma apoplexy (PAA). Cardinal MRI characteristics of SIH may be overlooked if sellar region examination is not coupled with a comprehensive cranial MRI examination. Pituitary enlargement in SIH was described with increased prevalence, but mostly as an incidental observation in neuroradiological series, without detailed functional pituitary assessment or follow-up. Case report. A young female with SIH presented with an intra-suprasellar mass lesion, imitating PAA. Mildly affected pituitary function, absence of visual impairments, and favorable clinical course influenced the decision against urgent pituitary surgery. Subsequent MRI confirmed spontaneous regression in pituitary size in first 5 months, along with clinical, hormonal and perimetric stability. Her initial mild central hypocortisolism resolved spontaneously, while baseline and follow-up dynamic pituitary assessment revealed no other abnormalities. Subsequent 9 years of endocrinological and neuroradiological follow-up confirmed gradual spontaneous pituitary lesion reduction. Awareness is raised that SIH may constitute a diagnostic pitfall due to clinical, neuroradiologic and laboratory overlapping with PA apoplexy, potentially leading to unnecessary surgery.