Figure 10a. Lipoblastoma in a 4-month-old boy with an anterior neck mass. (a) Axial contrast-enhanced CT scan shows a mass extending from the left side of the neck and deviating the trachea to the right. The periphery of the mass is composed of small foci of fat (arrowhead) separated by thin septa and areas of low attenuation representing myxoid tissue (curved arrow). A larger focus of soft-tissue attenuation (straight arrow) is present centrally. (b) Photograph of the axially sectioned gross specimen shows a solid central element (arrow). Note lack of the typical yellow color of fat in the surrounding lobules (*) secondary to an admixture of adipose and myxoid tissue in this lipoblastoma.