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Diagnostic ultrasound ( PDFDrive )

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A

B

C

FIG. 44.11 Schematic of Normal Cervix and Cervical Funnel Shapes. (A) The normal closed internal os and the cervical canal appear T

shaped. (B)-(D) Different stages of funneling resemble the letters Y, V, and U.

D

A

B

C

D

FIG. 44.12 Normal Cervix and Cervical Funneling. (A) Transvaginal scan of normal cervix, showing a T-shaped closed internal os. (B)-(D)

Transvaginal scan shows different types of herniation of membranes, which respectively resemble the letters Y, V, and U. In D, with the U coniguration,

in this case the “U” is so deep there is no residual measurable closed cervical length.

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