Presentation
Seizures.
Patient Data
The tuber cinereum and left mammillary body show a small solid mass lesion with isointense T1, slightly hyperintense T2 / FLAIR signal. It measures about 1.2 x 1 cm in its main axial dimensions. The lesion shows no significant post-contrast enhancement. Normal right mammillary body.
The remainder of the brain is unremarkable.
Conclusion:
Hypothalamic (tuber cinereum and left mammillary body) mass lesion; tuber cinereum hamartoma.
Case Discussion
The floor of the 3rd ventricle from the pituitary stalk to the mammillary bodies is called the tuber cinereum; it should be smooth. Any nodularity within should raise the suspicion of a tuber cinereum (hypothalamic) hamartoma. Small, non-enhancing mass lesion contiguous with the tuber cinereum is almost always diagnostic of tuber cinereum hamartoma.
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