Hypophysenstiel
en:Pituitary
gland in MRI (T1 sagittal without contrast enhancement). The arrow points at the posterior pituitary (Neurohypophysis, signalintens), the arrowhead at the anterior pituitary (Adenohypophysis).
Pituitary
gland • Pituitary (illustrations) - Ganzer Fall bei Radiopaedia
Pituitary
gland • Pituitary MRI - normal study - Ganzer Fall bei Radiopaedia
The pituitary stalk, also known as the infundibulum or infundibular stalk, is largely outside the blood brain barrier like the rest of the pituitary and therefore normally enhances following the administration of gadolinium. It gradually tapers inferiorly, and superiorly is spread by the infundibular recess of the third ventricle.
There have been some studies looking at the range of normal sizes of the pituitary stalk. One study had a normal range of:
- 3.25 mm +/- 0.56 (SD) at the level of the optic chiasm
- 1.91 mm +/- 0.40 (SD) as the stalk enters the pituitary gland proper
in other words, 95% of patients should have a stalk that measures no more than:
- 4.4 mm at the level of the optic chiasm, and
- 2.7 mm just above the gland
Related pathology
- differential diagnosis of pituitary stalk abnormal enhancement
Siehe auch:
- Tumoren der Hypophysenregion
- verdickter Hypophysenstiel
- Hypophyse
- dritter Ventrikel
- Gadolinium
- deviated pituitary stalk
- Bluthirnschranke
- Hypophysenstieldurchtrennung
und weiter:
Assoziationen und Differentialdiagnosen zu Hypophysenstiel:
