Ectopic posterior pituitary
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Sagittal T1 images demonstrate an ectopic location of the posterior pituitary bright spot, seen on the superior surface of the gland instead of being posterior to the gland. Dynamic study of the gland within 0 to 3 minutes post contrast administration shows a normal appearance of the anterior pituitary gland with no mass. Minimal leftwards deviation of the stalk.
Apart from the ectopic location of the hot spot, no other cause to explain the abnormal hormonal imbalance in this patient.