<prompt> Bilateral proptusis in children is the most common presentation of:NeurofibromatosisLeukemiaCavernous hemangiomaMalignant fibrous Histiocytoma  <response>: Ans. b. Leukemia Ref: The Massachussets Eye and ear Infirmary review manual for Ophthalmology by juger Lamkin Lippincott Williams 3e p159, 186; Harleys Pediatric Ophthalmology Lippincott Williams and Wilkins 2005371Leukemic infiltration into the orbit chloroma is the most common cause of bilateral proptosis in children amongst the option provided.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, 186Causes of Bilateral ProptosisLymphomasQLeukemiaQSecondaries from:NeuroblastomaQNephroblastomaQEwings sarcomaQMC cause of unilateral proptosis in childrenOrbital cellulitisQMC cause of non-inflammatory unilateral proptosis in childrenDermoid cystQMC cause of bilateral proptosis in childrenNot definitively establishedMetastatic neuroblastomaQ andor leukemiaQ chloromaMC cause of unilateral proptosis in adultsThyroid ophthalmopathyQMC cause of bilateral proptosis in adultsThyroid ophthalmopathyQBailey and Johnson Head and Neck Surgery 41513MC benign orbital tumor in adultsCavernous HemangiomaQMC malignant orbital tumor in adultsLymphomaQMC benign orbital tumor in childrenDermoid cystQMC malignant orbital tumor in childrenRhabdomyosarcomaQ 