32.下列關於肺動脈狹窄（pulmonic stenosis）的敘述，何者錯誤？
(A)犬隻為遺傳性疾病
(B)好發於米格魯（beagle）、英國牛頭犬（English bulldog）及吉娃娃（Chihuahua）
(C)瓣膜下纖維性或肌肉組織帶形成或瓣膜畸形等造成
(D)會造成右心室明顯不對稱性肥大（eccentric hypertrophy）

Pulmonic Stenosis.

好發品種: (A)(B)

Pulmonic stenosis has been recognized as a frequently occurring anomaly in dogs and is inherited in the beagle
(Fig. 10-32). Other breeds in which this lesion is frequent are basset hound, boxer, Chihuahua, Chow Chow, cocker spaniel, English bulldog, Labrador retriever, mastiff, Newfoundland, Samoyed, schnauzer, and terrier.

病變:(C)(D)

Several types of valvular lesions have been described and include formation of a circumferential band of fibrous or muscular tissue beneath the valve (subvalvular stenosis) or malformation of the valve (valvular stenosis), with a small central orifice in a dome of thickened valvular tissue. A unique form of subvalvular pulmonic stenosis has been described in English bulldogs and boxers in which an anomalous development of a coronary artery obstructs the right ventricular outflow tract. Notable concentric hypertrophy of the right ventricle develops from the resulting pressure overload.

Pathologic Basis of Veterinary Disease, 6th Edition, p.584