Greater than 50 % funneling before 25 weeks is associated with approximately 80 % risk of preterm delivery.
Good scanning technique is essential, as excessive pressure with the probe, or presence of a distended bladder may artificially narrow the canal.
- percentage funnelling : funnel length / ( functional cervical length + funnel length)
- 1. Hricak H, Chang YC, Cann CE et-al. Cervical incompetence: preliminary evaluation with MR imaging. Radiology. 1990;174 (3): 821-6. Radiology (abstract) - Pubmed citation
- 2. Bowie JD, Andreotti RF, Rosenberg ER. Sonographic appearance of the uterine cervix in pregnancy: the vertical cervix. AJR Am J Roentgenol. 1983;140 (4): 737-40. AJR Am J Roentgenol (abstract) - Pubmed citation
- 3. Hassan S, Romero R, Hendler I et-al. A sonographic short cervix as the only clinical manifestation of intra-amniotic infection. J Perinat Med. 2006;34 (1): 13-9. doi:10.1515/JPM.2006.002 - Free text at pubmed - Pubmed citation
Synonyms & Alternative Spellings
|Synonyms or Alternative Spelling||Include in Listings?|
|Funneling of the cervical os||✗|