Multifocal anaplastic large T cell lymphoma of the ethmoid sinuses, temporalis muscle and frontal lobe in a 17-year-old boy

Axial CT scan post intravenous contrast administration displaying a diffusely enlarged left temporalis muscle (large arrowhead). Bilateral ethmoid opacification (thin arrow) was also incidentally noted.

Axial T2 (left) and T1 (right) weighted MRI post intravenous gadolinium administration. Note the solid epidural mass which does not enhance on T2 (arrowhead) and enhances on T1 (thick arrow). A hyper intense subdural collection is also noted on T2 (thin arrow). There is also an obvious left temporal swelling as was seen in Fig. 1.

Coronal CT scan post intravenous contrast administration showing widespread disease within the left ethmoid air cells (arrow) and extending up to the level of the fovea ethmoidalis.