Ectopic posterior pituitary

Case contributed by Utkarsh Kabra
Diagnosis almost certain

Presentation

Short stature with lack of secondary sexual characteristics.

Patient Data

Age: 18 years
Gender: Male
mri

Nodular T1 hyperintense area, measuring approx. 3mm is seen in median eminence, at posterior aspect of optic chiasma. Normal posterior pituitary bright spot is not visualized. Infundibular stalk is not well visualized.

Corpus callosum and optic chiasma appear normal.

No focal intraaxial lesion seen in brain parenchyma.

Cerebellar folia appear prominent.

Case Discussion

Findings are suggestive of ectopic posterior pituitary which is likely to be responsible for the patient's short stature and lack of secondary sexual characteristics.

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