Figure 3. (A) Initial axial T1-weighted magnetic resonance imaging (MRI), (B) fat-suppressed after gadolinium contrast, and (C) fat-suppressed T2-weighted sequences. (D) Subsequent follow-up MRI in T2-weighted sequence is also exhibited. T1 lengthening of marrow signal within left zygomatic bone is shown (arrows in A point toward bilateral zygomatic bones for comparison), indicating fatty marrow replacement. There is enhancing periosteal reaction surrounding the left zygomatic bone, which can be seen to extend minimally into the extraconal fat of adjacent left orbit. The left lateral rectus muscle returns normal signal intensities. No subperiosteal abscess is detected within the orbit. The left temporalis muscle and fascia appear swollen, returning a hyperintense signal at T2-weighted sequence (arrow in C) and enhanced after gadolinium. Note also the surrounding subcutaneous fat stranding at the left premaxillary space (arrowheads in C) and enhancement of subcutaneous fat overlying said temporal muscle (arrowheads in B). (D) Subsequent follow-up MRI shows resolution of the T2 altered signal demonstrated by the left temporalis muscle.