Fetal for Wednesday, June 3rd, 2026

Contributed by CHU de Québec (CHUL)
Marie-Hélène Paul, and Guylaine Gleeton.

History

A 28-year-old multigravida was referred to our department for the evaluation of a fetal abdominal cyst detected incidentally at 28 +5 weeks. During the first trimester examination, the nucal translucency was normal. A fetal morphological ultrasound performed at 26 weeks revealed left renal pelvis ectasia (4,6 mm) with hydroureter. The ultrasound performed at 28 weeks in our institution revealed bilateral hydronephrosis, ascites, bladder dilatation and a retro vesical mass.

Images (Click any image to enlarge)

Fetal US showing an anechoic cystic retro vesical mass.
Sagittal T2 HASTE images showing a pelvic mass posterior to the bladder and anterior to the rectum with high T2 content corresponding to fluid.
Axial T2 HASTE
Coronal T2 HASTE

Question

What is the diagnosis?

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