一位73 歲男性數度發生呼吸困難，並出現心包囊及肋膜腔積水，影像學檢查發現肝腫大充血，尿中5-hydroxyindoleacetic acid 為40 mg/24 小時（正常值為0.7-8.2 mg/24 小時）。病人後來接受肺動脈瓣及三尖瓣置換手術，下列敘述中何者最符合此病人右心瓣膜的病理變化？
Deposition of mucoid material in spongiosa
Calcification and fibrosis at the base of valves
Plaque-like intimal thickening and smooth muscle cell proliferation
Subendocardial accumulation of elastic fibers
