Is right atrioventricular valve always tricuspid?

A 71-year-old male with a medical history of hypertension was admitted to emergency department with hypertensive pulmonary edema. The patient appeared anxious and diaphoretic, and physical examination revealed tachypnea, crepitant rales in the both lungs and a systolic ejection murmur at the right sternal border, radiating to the both carotid arteries. The electrocardiography showed sinus tachycardia with indications of left ventricle hypertrophy Before the aortic valve surgery, transesophageal echocardiography (TEE) was performed for detailed evaluation of the aortic valve. Two-dimensional TEE showed mild tricuspid valve regurgitation and only two of three leaflets of the tricuspid valve at a time.