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FIG 5. T2-weighted MR images with magnified views (insets) show the relation of the intra-hypothalamic component of the hamartoma to myelinated fiber tracts and gray matter of the hypothalamus in two patients.
A, Axial section shows anterolateral displacement of the postcommissural fornix on the left when compared with the unaffected right fornix, plus increased T2 signal intensity of the hamartoma relative to the hypothalamus.
B, Parasagittal section obtained at the level of the fornix shows the hamartoma between the postcommissural fornix anteriorly and the mammillothalamic tract posteriorly. Labeled are the postcommissural fornices (black arrows), mammillothalamic tracts (white arrows), and anterior commissure (arrowhead).
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