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Clinical and Experimental Obstetrics & Gynecology  2021, Vol. 48 Issue (4): 991-994    DOI: 10.31083/j.ceog4804158
Case Report Previous articles |
The brainstem-tentorium angle revisited. Difficulties encountered and possible solutions
Laura Joigneau1, 2, Yolanda Ruiz1, 2, 3, Coral Bravo2, 3, Julia Bujan4, 5, 6, Miguel A Ortega4, 5, 6, 7, *, †, Juan De León-Luis 1, 2, 3, 8, †
1Department of Radiology. University Hospital Gregorio Marañón. 28009 Madrid, Spain
2Fetal Medicine Unit, Maternal and Child Health and Development Network, Department of Obstetrics and Gynecology, Gregorio Marañón Hospital, 28009 Madrid, Spain
3Department of Obstetrics and Gynecology, Complutense University of Madrid, 28009 Madrid, Spain
4Ramón y Cajal Institute of Healthcare Research (IRYCIS), 28034 Madrid, Spain
5Department of Medicine and Medical Specialties, Faculty of Medicine and Health Sciences, University of Alcalá, Alcalá de Henares, 2880 Madrid, Spain
6University Center for the Defense of Madrid (CUD-ACD), 28047 Madrid, Spain
7Department of Cancer Registry and Pathology, Hospital Universitario Principe de Asturias, Alcalá de Henares, 28801 Madrid, Spain
8Department of Public and Maternal and Child Health, School of Medicine, Complutense University of Madrid, 28801 Madrid, Spain
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Background: Fetal posterior fossa fluid collections (PFFC) can range from normal variants to severe anomalies with highly variable neurological prognosis. The diagnosis of these entities is still a challenge for ultrasound as well as for fetal magnetic resonance imaging (MRI). The measurements of the brainstem-vermis angle (BV angle) and the brainstem-tentorium angle (BT angle) have been described as helpful in the differential diagnosis of the PFFC. Case: We present a case with posterior fossa abnormalities where the measurement of the BT angle could be difficult due to the anatomy distortion. Conclusion: We propose two alternative ways of measuring the BT angle that could be reliable in all the spectrum of PFFC.
Key words:  Fetal posterior fossa fluid collections      Fetal magnetic resonance imaging      Brainstem-tentorium angle      BT angle      brainstem-vermis angle     
Submitted:  22 November 2020      Revised:  11 January 2021      Accepted:  19 January 2021      Published:  15 August 2021     
FIS-PI18/00912/Instituto de Salud Carlos III (Plan Estatal de I + D + i 2013-2016)
FIS-PI13/02769/Instituto de Salud Carlos III (Plan Estatal de I + D + i 2013-2016)
BA#09/90011/Instituto de Salud Carlos III (Plan Estatal de I + D + i 2013-2016)
B2017/BMD-3804 MITIC-CM/European Development Regional Fund “A way to achieve Europe” (ERDF)
*Corresponding Author(s):  Miguel A Ortega     E-mail:
About author:  These authors contributed equally.

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Laura Joigneau, Yolanda Ruiz, Coral Bravo, Julia Bujan, Miguel A Ortega, Juan De León-Luis. The brainstem-tentorium angle revisited. Difficulties encountered and possible solutions. Clinical and Experimental Obstetrics & Gynecology, 2021, 48(4): 991-994.

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