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Measurements of the normal pituitary stalk
Mean ± SDRange
Diameter at the pituitary insertion (mm)
    Anteroposterior2.32 ± 0.391.65–3.17
    Transverse2.16 ± 0.371.56–3.04
Diameter at the level of optic chiasm (mm)
    Anteroposterior3.25 ± 0.432.25–4.08
    Transverse3.35 ± 0.442.39–4.21
Length of the stalk (mm)5.91 ± 1.243.26–8.66
Depth of the infundibular recess (mm)4.69 ± 0.873.28–6.52
Ratio of the length of the stalk to the depth of the infundibular recess1.30 ± 0.390.70–2.19