<prompt> Most common cause of bilateral proptosis in children:RhabdomyosarcomaPNETRetinoblastomaNeuroblastoma  <response>: Ans. d. Neuroblastoma Ref: Khurana 4e p381; Parsons 21e p480-485: Kanski 7e p80-114; Yanoffs 3e p1450-1464; The Massachussets Eye and ear Infirmary review manual for Ophthalmology by juger Lamkin Lippincott Williams 3e p159, 186Most common cause of bilateral proptosis in children is Neuroblastoma.The most common cause of bilateral proptosis in children is not definitively established, but metastatic neuroblastoma andor leukemia chloroma should be considered. - The Massachussets Eye and ear Infirmary review manual for Ophthalmology 3e p159, 186.Causes of Bilateral ProptosisLymphomasQLeukemiaQSecondaries from:NeuroblastomaQNephroblastomaQEwings sarcomaQMC cause of unilateral proptosis in children Orbital cellulitisQMC cause of non-inflammatory unilateral proptosis in children Dermoid cystQMC cause of bilateral proptosis in children Not definitively established Metastatic neuroblastomaQ andor leukemiaQ chloromaMC cause of unilateral proptosis in adults Thyroid ophthalmopathyQMC cause of bilateral proptosis in adults Thyroid ophthalmopathyQ MC benign orbital tumor in adultsCavernous HemangiomaQMC malignant orbital tumor in adultsLymphomaQMC benign orbital tumor in childrenDermoid cystQMC malignant orbital tumor in childrenRhabdomyosarcomaQ 