Cause of myringosclerosis is
Grommet inseion is preferred if myringotomy and aspiration combined with medical measures have not helped and fluid recurs, a grommet is inseed to provide continued aeration of the middle ear. It is left in place for weeks or months or till it is spontaneously extruded. Ref - PL DHINGRA diseases of ear nose and throat, 6th edition, page no 65
Genetic
Grommet inseion
Otosclerosis
Idiopathic
Ear