Background: Undifferentiated embryonal sarcoma of the liver is a rare malignant mesenchymal tumour occurring mostly in children ages 6–10 years. The discrepancy between its solid appearance on US and cystic-like appearance on CT has been described. Objective: To study the imaging particularities and similarities among our cases of undifferentiated embryonal sarcoma and to report the errors in initial diagnoses. Materials and methods: We conducted a retrospective study of 15 children with undifferentiated embryonal sarcoma diagnosed or referred to our hospital during 1997–2015 and analysed the clinical, biological and imaging data. Results: We identified eight boys and seven girls ages 9 months to 14 years. Ten children presented with abdominal pain. Alpha-fetoprotein was slightly increased in one. Initial US and CT had been performed for all, while additional MRI had been done in two children. Initial CT demonstrated a hypoattenuated mass in all. Rupture was seen in five and intratumoural bleeding in seven children. Tumour volumes reduced during neoadjuvant chemotherapy in 10 children. Conclusion: Undifferentiated embryonal sarcoma might be suggested in a non-secreting unifocal tumour with well-defined borders, fluid-filled spaces on US, hypoattenuation and serpiginous vessels on CT, and if there are signs of internal bleeding or rupture on CT or MRI.
CITATION STYLE
Gabor, F., Franchi-Abella, S., Merli, L., Adamsbaum, C., & Pariente, D. (2016). Imaging features of undifferentiated embryonal sarcoma of the liver: a series of 15 children. Pediatric Radiology, 46(12), 1694–1704. https://doi.org/10.1007/s00247-016-3670-3
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