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要 約
2日齢のホルスタイン種，雌子牛で右下行大動脈を伴う左大動脈弓が認められた．上行大動脈は右心室から起始し，上行して気管の左側で左大動脈弓に移行していた．左大動脈弓は両頸動脈と左鎖骨下動脈を分岐した後，正中へ向かい，気管と食道の背方を右に通
過し，右鎖骨下動脈を分岐して右下行大動脈に結合していた．気管と食道は上行大動脈，左大動脈弓，右下行大動脈および右鎖骨下動脈で形成された不完全な血管輪で圧迫されていた．本例には心房逆位 ，僧帽弁両室挿入，両大血管右室起始，心室中隔欠損，大動脈峡部の管状低形成，左冠状動脈左室瘻，右肋頸静脈左房流入などが合併していた．
―キーワード：子牛，右下行大動脈を伴う左大動脈弓．
--------------------日獣会誌 54，99〜101（2001）
Three Cases of Congenital Lymphedema
in Japanese Shorthorn Cattle
Jun SATO＊†, Reeko SATO, Naoichiro HATAKEYAMA,
Yoh-ichi MIYAKE, Masanobu GORYO and Yoshihisa NAITO
＊Faculty of Agriculture, Iwate University, 3-18-1 Ueda,
Morioka 020-8550, Japan
SUMMARY
Three Japanese shorthorn cattle (two males and one female: 2〜18 months old) born with
difficulty demonstrated severe generalized cold edema. In case No. 3, to clarify disturbance of peripheral
lymph flow, 3 ml of India ink was injected subcutaneously into the hock. At necropsy, in the subcutaneous
tissue, no ink absorption was observed in peripheral lymphatics, the injected ink was retained within
the injection site. Histopathological observation revealed dilation of the subcapsular sinus and edema
of the medullar cords in several lymph nodes. On the basis of these findings, the three cases were diagnosed
as congenital lymphedema. Hypoproteinemia, hypoalbuminemia, and decreased plasma osmotic pressure were
common to all three. It seemed that these changes were secondary to severe edema. This appears to be
the first case of congenital lymphedema in Japanese shorthorn cattle.
―Key words : calf, left aortic arch with right descending aorta.
† Correspondence to : Takayuki MURAKAMI (Faculty of Agriculture, Miyazaki University) 1-1 Gakuen-Kibanadai-nishi,
Miyazaki 889-2192，Japan
TEL・FAX 0985-58-7263
--------------------J. Jpn. Vet. Med. Assoc.、54, 99〜101 (2001) |
