US
Ocular ultrasonography is useful in evaluation of an ocular tumor and commonly used as a first-line imaging technique for screening of ocular pathology in the pediatric population. It maintains an advantage in pediatric patients due to low cost, wide availability, lack of radiation exposure and can often be done without sedation. It is also sensitive for detection of calcification8. US can easily evaluate mass lesions of the globe. However, the visualization of deeper lesions, including retrobulbar lesions, is limited as the US wave cannot adequately penetrate to such deep structures. Furthermore, calcifications can obscure adjacent lesions and consequently limit assessment of the optic nerve. US alone is therefore not an adequate, complete diagnostic tool for definitive evaluation/ staging of ocular tumors such as retinoblastoma and medulloepithelioma.