Parachute deformity of tricuspid valve

Abstract

A parachute anomaly of an atrioventricular (AV) valve, as first described by Swan et al. (1949) and later correlated to particular associated malformations and abnormalities by Shone et al. (1963), has always referred only to the morphologically mitral valve (MV). A parachute deformity of an AV valve happens when all the chordae tendineae arise from a single papillary muscle or single muscle group. Of course, sometimes, the normal number of papillary muscles is present, but one papillary muscle is much bigger than its peers and demonstrates some characteristic features; and this type is known as a parachute-like asymmetric valve and has been well defined in the MV position and rarely in the tricuspid valve (TV). Also, rarely the dominant muscle may be directly attached to the AV valve leaflet with no separate chordae [1–4].