All cases were identified as MCA aneurysm by DSA and operation.是什么意思？

All cases were identified as MCA aneurysm by DSA and operation.

DSA和手术证实为MCA动脉瘤破裂.

all

adj. 全部的，一切的，各种的，极度的，尽量的；pron. 全部，一切，每个人，每件东西，全部情况；adv. 全部地，完全地，每个，非常；n. 全体，[常作A-]整体，[常与my, your, his, her等连用]（某人）所有的一切；

例句
Many parents simply abdicate all responsibility for their children.
许多父母对孩子简直是完全撒手不管。

cases

n. 案例，病例（ case的名词复数 ），（需特别对待或注意的）人，事例，容器；

例句
In many cases the disease will clear up of its own accord.
这种病很多情况下会自愈。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

identified

v. 认出( identify的过去式和过去分词 )，支持，确认，辨认；

例句
He was identified only by his uniform and personal belongings.
他的身份只是通过制服和个人财物确定了下来。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

MCA

abbr. monetary compensatory account(ing) 货币补偿账目，monetary compensation amounts 货币补偿数量，money compensatory account(ing) 货币补偿账目，minimum control airspeed 最小空速控制；

例句
Petter says his aim as Director of the MCA is to.
20Petter说他作为MCA的主管目标是.

aneurysm

n. 动脉瘤；

例句
A false aneurysm is the term applied when only the adventitia is present.
假性动脉瘤一词用于只有一层动脉外膜的动脉瘤.

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

DSA

abbr. dimensionally-stabilized anode 空间稳定的正极，形状稳定的阳极，discrete sample analyzer 不连贯的标本分析器；

例句
Objective To discuss the nursing of DSA in therapy of angiofibroma of nasopharynx.
目的:探讨数字减影血管造影辅助鼻内镜治疗鼻咽纤维血管瘤的护理.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

operation

n. 操作，经营，手术，[数]运算，作用；

例句
...the operation a patient has had.
病人做过的手术