Figure 14.

A 3 year-old boy with embryonal rhabdomyosarcoma. A. Axial T2 shows a well-defined, hyperintense mass involving the retrobulbar and extraconal soft tissues, without destruction of the bone or distortion of adjacent structures. B. Axial fat-suppressed T1 with contrast shows intense, homogeneous enhancement. This mass has certain features that are common to capillary hemangioma. However, continued growth of the mass after the first year of life, absence of flow voids, and absence of discrete lobules with T2 hypointense septations, are features that suggest an alternative diagnosis.