Hemodialysis: relationship between signal intensity of the posterior pituitary gland at MR imaging and level of plasma antidiuretic hormone.

Sato, Noriko; Endo, Keiko; Kawai, Hisaomi; Shimada, Aya; Hayashi, Mitsunori; Inoue, Takashi

doi:10.1148/radiology.194.1.7997567

Cited by 16 publications

(6 citation statements)

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“…Loss of PPHI was observed in central diabetes insipidus due to idiopathic, inflammatory, or neoplastic processes, including pituitary adenoma. 8,[18][19][20][21][22][23] The stalk was sometimes unclear due to pituitary tumoral compression. Pituitary symmetry or asymmetry depends on tumor size, location, or invading areas.…”

Section: Discussionmentioning

confidence: 99%

Parasellar T2 Dark Sign on MR Imaging in Patients with Lymphocytic Hypophysitis

Nakata¹,

Sato²,

Masumoto³

et al. 2010

AJNR Am J Neuroradiol

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Section: Discussionmentioning

confidence: 99%

Parasellar T2 Dark Sign on MR Imaging in Patients with Lymphocytic Hypophysitis

Nakata¹,

Sato²,

Masumoto³

et al. 2010

AJNR Am J Neuroradiol

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“…The signal intensity of the posterior lobe on T1-weighted image is believed to re¯ect the content of neurosecretory granules containing AVP (13). Furthermore, it is known that this hyperintense signal may disappear in situations characterised by AVP depletion, such as diabetes insipidus (14) or in the case of persistent AVP hypersecretion (15).…”

Section: Methodsmentioning

confidence: 99%

Urinary aquaporin-2 excretion in nocturnal enuresis

Radetti

Paganini

Rigon

et al. 2001

European Journal of Endocrinology

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Objective: To evaluate the role of the arginine vasopressin (AVP)±aquaporin-2 (AQP-2) axis in the pathogenesis of nocturnal enuresis. Study participants: Twelve children (seven male and ®ve female), aged 11X6^4X3 (6.7±15.6) years, suffering from primary monosymptomatic nocturnal enuresis and 12 healthy children, matched for sex and age. Enuretic children were further subdivided into responders and non-responders to treatment with 1-desamino-8-d-AVP (DDAVP). Methods: Serum concentrations of AVP, and plasma and urine osmolality were measured at night (0100, 0400 and 0700 h), together with nocturnal urinary excretion of AQP-2 (2000±0800 h). Magnetic resonance imaging (MRI) of the pituitary gland was carried out to evaluate the amount of AVP stored in the posthypophysis. Results: Mean AVP serum concentrations were similar in patients and controls. Urinary AQP-2 was also similar in patients and controls, but responders had a signi®cantly lower level of AQP-2 than non-responders P , 0X005X Plasma osmolality was greater in patients than in controls P , 0X001Y whereas urinary osmolality was similar in both groups. No difference in the ratio of the signal intensity of the posterior lobe of the hypophysis to that of the pons (AVP content) was found between patients and controls or between responders and non-responders. Conclusion: A decreased urinary excretion of AQP-2 is associated with, and seems to have a role in, nocturnal enuresis, at least in some children, and this could also explain why only some of them respond to DDAVP treatment.

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“…Clinically, the depleted posterior lobe was reported in elderly people and patients with haemodialysis, anorexia nervosa and septic shock (8–11). However, the depleted posterior lobe occurs in a more common disease, diabetes mellitus.…”

Section: Depleted Posterior Lobementioning

confidence: 99%

Magnetic Resonance Imaging of the Hypothalamic‐Neurohypophyseal System

Fujisawa

2004

J Neuroendocrinology

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Magnetic resonance imaging (MRI) is a revolutionary advance in diagnostic imaging of the hypothalamic-neurohypophyseal system (HNS). The detailed anatomy of the sellar and parasellar region is clearly visible using MRI, because it has no bony artifacts and multidirectional capability. The posterior lobe of the pituitary gland displays a characteristic bright signal on the MR T1-weighted image (T1WI), and is distinctly separated from the anterior lobe. The bright signal is absent in patients with central diabetes insipidus, and is thought to reflect normal vasopressin storage in the posterior lobe. The signal intensity ratio of the posterior lobe to the pons on T1WI is strongly correlated with vasopressin content in the posterior lobe. In addition to the morphological evaluation, MRI provides unique information concerning the function of the HNS. The MRI findings of the HNS (normal condition, central diabetes insipidus, a depleted posterior lobe, an ectopic posterior lobe, and a damming-up phenomenon of the neurosecretory vesicles in the pituitary stalk) are demonstrated in this article.

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Hemodialysis: relationship between signal intensity of the posterior pituitary gland at MR imaging and level of plasma antidiuretic hormone.

Abstract: Elevated plasma osmolality may cause increased plasma ADH concentration and a lack of hyperintensity in the posterior pituitary gland at MR imaging.

Cited by 16 publications

References 0 publications

Parasellar T2 Dark Sign on MR Imaging in Patients with Lymphocytic Hypophysitis

Parasellar T2 Dark Sign on MR Imaging in Patients with Lymphocytic Hypophysitis

Urinary aquaporin-2 excretion in nocturnal enuresis

Magnetic Resonance Imaging of the Hypothalamic‐Neurohypophyseal System

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