Shortening of the uterine cervical canal as the name implies refers to an abnormal shortening of the uterine cervical length. It is considered a sign of cervical incompetence during pregnancy and can lead to premature delivery.
- primary (i.e. congenital/idiopathic)
- multiple gestations
- obstetric/gynecological trauma
- increase in prostaglandins 4
In a single pregnancy, the cervical length is usually considered to be ~4 cm up until 37 weeks, while in multifetal pregnancy it can often be <3 cm by 32 weeks 1.
An endocervical canal length of <3 cm or <2.5 cm (depends on the institution) is considered diagnostic of shortening 4,5.
- 1. Bluth EI. Ultrasound, a practical approach to clinical problems. Thieme Publishing Group. (2008) ISBN:3131168323. Read it at Google Books - Find it at Amazon
- 2. Ricciotti HA, Burke L, Kobelin M et-al. Ultrasound evaluation of cervical shortening after loop excision of the transformation zone (LETZ). Int J Gynaecol Obstet. 1995;50 (2): 175-8. Int J Gynaecol Obstet (link) - Pubmed citation
- 3. Crane JM, Hutchens D. Follow-up cervical length in asymptomatic high-risk women and the risk of spontaneous preterm birth. J Perinatol. 2011;31 (5): 318-23. doi:10.1038/jp.2010.149 - Pubmed citation
- 4. Grant, Griffin. Grainger & Allison's Diagnostic Radiology Essentials. Churchill Livingstone. ISBN:B00CC6IA3Y. Read it at Google Books - Find it at Amazon
- 5. Wadhwa V. Measurements in Radiology Made Easy. Jaypee Brothers Medical Pub. ISBN:9350252643. Read it at Google Books - Find it at Amazon