Cervical funneling is a sign of cervical incompetence and represents the dilatation of the internal part of the cervical canal and reduction of the cervical length.
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Radiographic features
Ultrasound
Good scanning technique is essential, as excessive pressure with the probe, or presence of a distended urinary bladder may artificially narrow the cervical canal. Preferably, a transvaginal scan is recommended for accurate assessment of cervical length and measurement of funneling ref.
Sonographic features include:
percentage funneling: funnel length/(functional cervical length + funnel length) ref
shape of funneling: V-shaped or U-shaped. U-shaped funneling have a higher risk of preterm delivery 4
depth and width of the funnel: V-shaped funnel has a depth with no width; however, U-shaped funnel has the width as an important parameter
Treatment and prognosis
>50% funneling before 25 weeks is associated with ~80% risk of preterm delivery ref.
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