<prompt> J-shaped sella isare seen in:MucopolysaccharidosesAchondroplasiaOptic chiasm gliomaAll  <response>: D i.e. All i.e. Mucopolysaccharidoses, Achondroplasia, Optic chiasm glioma, Neurofibromatosis I, Hydrocephalus Sella turcica is a cup shaped depression in the central basisphenoid bone that contains the pituitary gland and inferior pa of the infundibular stalk. Flattened tuberculum sellae with a prominent sulcus chiasmaticus are the factors responsible for sella looking J shaped on lateral skull x-ray. The normal dorsal sellae forms the loop of J. J shaped sella turcica is seen in : Mn - COMAND or CONMAN Must Die - Chronic hydrocephalusQ dt enlarged anterior aspect of 3rd ventricle - Osteogenesis imperfecta, Optic chiasm gliomaQ glioma Dorsum -- may be bilateral 1t W or omega shped sella; if chiasmatic sellae sulcus is very depressed. - MucopolysaccharidosesQ eg Hurler syndrome Hunter syndrome - AchondroplasiaQ - NeurofibromatosisQ type 1 is usually aw slowly growing optic glioma which may extend upto chiasma; Normal variant 5 - Dysostosis multiplex defect in carbohydrate metabolism. - Hajdu-Cheney syndrome congenital hypothyroidism are other rare causes 