MR imaging of pituitary dwarfism

Area of Science:

• Radiology
• Pediatrics
• Endocrinology

Background:

• Idiopathic pituitary dwarfism is a condition characterized by impaired growth due to insufficient pituitary hormone production.
• Perinatal abnormalities and hormonal imbalances are often implicated in the development of pituitary dwarfism.

Purpose of the Study:

• To investigate the correlation between magnetic resonance (MR) findings in idiopathic pituitary dwarfism and clinical history.
• To determine the association between MR imaging results, perinatal factors, and pituitary hormone levels.

Main Methods:

• MR examinations were conducted on 18 patients diagnosed with pituitary dwarfism.
• Patients were categorized into two groups: those with ectopic posterior pituitary lobes and those with normal posterior pituitary lobes.
• Clinical histories, including perinatal events and pituitary hormone levels, were analyzed.

Main Results:

• Seven patients had ectopic posterior pituitary lobes, identified by MR as a hyperintense signal at the median eminence of the hypothalamus.
• These patients exhibited smaller pituitary gland dimensions and a higher incidence of breech presentation with perinatal asphyxia.
• Six out of seven patients with ectopic lobes had significantly low peak serum growth hormone levels.
• Eleven patients with normal posterior lobes showed generally normal MR findings, with slightly smaller pituitary gland size and a history of perinatal asphyxia in one case.

Conclusions:

• The presence of an ectopic posterior pituitary lobe, visualized on MR imaging, may be a common finding in pituitary dwarfism following perinatal hypoxic-ischemic events.
• MR imaging can help identify pituitary abnormalities associated with growth hormone deficiency and perinatal complications.