Fig. 12
From: Orbital tumours and tumour-like lesions: exploring the armamentarium of multiparametric imaging
4-year-old girl with a left orbital RMS. a. Axial T2W MR image of the orbits shows a conal-extraconal polypoid mass of moderately low signal intensity located superior to the left globe. b. ADC map shows restricted diffusion (ADC = 1 × 10 −3 mm2/s), suggestive of malignancy. c. Coronal contrast-enhanced FS T1W MR image shows avid enhancement within the lesion. d. Axial FDG PET/CT image of the same patient shows high SUVs (SUVmean = 6, SUVmax = 9). Although the lesion may mimic a cavernous hemangioma on the T1W and T2W images, the low ADC and the high FDG uptake strongly suggest a malignant tumour. Histology revealed embryonal rhabdomyosarcoma