Introduction:

The pediatric patient with an orbital mass lesion differs substantially from the adult patients with a much greater incidence of congenital lesions, higher frequency of infection and unique benign and malignant tumor involving the orbit and its contents. The structure complexities of the orbit and its contents present imaging challenges. In addition, orbit and eye proper may be involved by spread from adjacent structures or from lesion affecting visual pathway. However, high resolution CT has become the preferred modality for imaging orbital pathology (1-4).
The purpose of our study is to describe the high resolution CT appearances, differential diagnosis, frequency and

distribution of the orbito-ocular space occupying masses in Yemeni children.
Materials and Methods:
The present work is a prospective study that included 60 patients aged 1 month to 17 years (34 males and 27 females) with orbito-ocular space occupying lesions. The patients were referred to the CT department in three large referral centers, namely Kuwait University Hospital (Sana’a), Al-Thawrah General Hospital (Sana’a) and Sana’a Radiology Center (Sana’a) between January 2004 to January 2006. Visual acuity impairment, proptosis and muscle movement disorder are the most common presenting symptoms. All patients underwent HRCT study for the orbital region with contiguous thin section (1-