sac

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sac

 [sak]
a baglike organ or structure; see also bag, pocket, and pouch.
air s's (alveolar s's) the spaces into which the alveolar ducts open distally, and with which the alveoli communicate; see also lung.
amniotic sac the sac formed by the amnion, enclosing the fetus suspended in amniotic fluid; popularly known as the bag of waters.
conjunctival sac the potential space, lined by conjunctiva, between the eyelids and the eyeball.
endolymphatic sac the blind, flattened cerebral end of the endolymphatic duct.
hernial sac the peritoneal pouch that encloses protruding intestine.
lacrimal sac the dilated upper end of the nasolacrimal duct; see also lacrimal apparatus.
yolk sac the extraembryonic membrane connected with the midgut; in vertebrates below true mammals, it contains a yolk mass.
Yolk sac in a developing embryo. From Applegate, 2000.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

sac

(sak), Do not confuse this word with sack.
1. A pouch or bursa.
See also: sacculus. Synonym(s): saccus
2. An encysted abscess at the root of a tooth.
3. The capsule of a tumor, or envelope of a cyst.
[L. saccus, a bag]
Farlex Partner Medical Dictionary © Farlex 2012

sac

(săk)
n.
A pouch or pouchlike structure in an organism, sometimes filled with fluid.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

sac

A pouch or other enclosed anatomic structure.

SAC

Abbreviation for:
seasonal acute conjunctivitis
serous adenocarcinoma
Sexual Addiction and Compulsion
Specialty Advisory Committee, see there 
splinting for acute closure
standardised assessment of concussion
stoma appliance customisation
substance abuse counsellor
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

sac

Medtalk A pouch or other enclosed structure. See Alveolar sac, Gestational sac, Pouch, Yolk sac.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

sac

(sak)
1. A pouch or bursa.
Synonym(s): saccus [TA] .
2. An encysted abscess at the root of a tooth.
3. The capsule of a tumor, or envelope of a cyst.
See also: sacculus
[L. saccus, a bag]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

sac

Any bag-like organ or body structure.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

sac

a bag-like or pouched structure.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

sac

(sak)
1. Encysted abscess at the root of a tooth.
2. Pouch or bursa.
3. Capsule of a tumor, or envelope of a cyst.
[L. saccus, a bag]
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about sac

Q. what does it mean when an ultrasound shows an empty amniotic sac and no baby?

A. This exact thing happened with my friend who is now 22 weeks with her first baby. She had 2 additional sacs - both empty - and the doctor said that the pregnancy had probably started out as triplets but that only one of the embryos had actually established and continued to grow.

Her doctor said it is very common for a woman to have more than one egg fertilize but that in most cases the pregnancy continues as a singleton only. She told my friend that the empty sacs would just disappear through time (which they did) and that they posed no danger to her baby.

More discussions about sac
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