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2007-01-08-11 Answer to the case of the week 190 © Dillon

Answer to the case of the week #190

April 5 - April 19, 2007

Kathleen Comalli Dillon, BA, RDMS*, Fabrice Cuillier, MD, C**, P. Lemaire, MD***.


Diagnostic Medical Sonographer, Translator, Editor, Novato, California;


Department of Gynecology, Félix Guyon Hospital, 97400 Saint-Denis, Ile de la Réunion, France. Tel: 0262 90 55 22. Fax: 0262 90 77 30;


Sonographer, Mouffia Street, 97400 Saint- Denis, Ile de la Reunion, France.

We present the case of a 25-year-old patient, G1P0, scanned at 13 weeks GA. Her medical history was unremarkable. On sonography we found a live pregnancy with one embryo. Although nuchal translucency was normal, the fetus seemed to have acrania and a large encephalocele of 15 x 12 mm (images 1, 2, 3, and 4). The parents were informed of the anomaly and chose interruption of pregnancy. An amniocentesis was performed just before. The karyotype was normal (46, XX), as was the AFP result. Pathophysiologic analysis was performed. The diagnosis was not encephalocele; the entity was an interhemispheric arachnoid cyst  distending the cranium.

Images 1, 2. (1) Pregnancy at 13 weeks GA with “encephalocele.” (2) Pregnancy at 13 weeks GA with abnormal skull, with “acrania and encephalocele.” 


Images 3, 4. 3D views of fetus.


Images 5, 6. Postmortem view of the fetus.



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