A 3yo male child had no pain no fever, got swollen his posterior lower right leg, without history of trauma. Ultrasound this area in cross-section showed a hypoechoic tumor which belonged to the soleus muscle. In longitudinal scan the tumor was in size 6×4 cm, straitified structure like muscle, well limited in the muscular aponevrosis. In Doppler it was a hypervascular tumor.
MRI with CE: Very high and rapid enhance tumor with gado.
Opened biopsy was done in the CHILDREN HOSPITAL N0 2 on December 31. The microscopic result is an EMBRYONIC RHABDOMYOSARCOMA with specfic histo-immunologic staining, a very high malignant tumor.