<prompt> Hockey stick appearance on echo is a feature ofMitral stenosisMitral incompetenceAoic stenosisAoic regurgitation  <response>: Echocardiographic features of mitral stenosis:-Thickened and calcified mitral leaflets and subvalvular apparatus -Decreased E-F slope M-mode-Hockey stick appearance of the anterior mitral leaflet in diastolelong axis view-Immobility of the posterior mitral leaflet a similar appearance can be seen in hypereosinophilia or ergot use-Fish mouth orifice in the sho axis view-Increased LA size, with the potential for thrombus formationDynamic CT: the Restricted opening of the thickened valve from commissural fusion especially with rheumatic valve disease, valve calcification, or both results in a fish-mouth appearance on sho-axis images. Bowing of a thickened and fibrotic anterior leaflet during diastole may result in a hockey-stick appearance which is best seen on two- or four-chamber imagesRef: The echo manual by Jae K Oh; J B Seward; A Jamil Tajik, page no 202 