Laryngomalacia is the most common etiology of non-infectious molluscum in infancy.Endoscopic morphology revealed abnormal droop of sub-glottis structures in inhale.
The primary etiology of avascular necrosis of the femoral head (AVN) appears to be circulating microemboli that block the microcirculation of the femoral head.
In survivors, there can be a transition of EIEE into other epileptic syndromes like West syndrome and Lennox-Gastaut syndrome; which have similar underlying etiologies.
Besides central DI further underlying etiologies of DI can be due to other primary forms (renal origin) or secondary forms of polyuria (resulting from primary polydipsia).