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see Sac and FoxSac and Fox,
closely related Native Americans of the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). Sac and Fox culture was of the Eastern Woodlands area with some Plains-area traits (see under Natives, North American).
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A soft-walled cavity within a plant or animal, often containing a special fluid and usually having a narrow opening or none at all.
Indentation in the contour lines of equal depth showing submarine relief.


a pouch, bag, or pouchlike part in an animal or plant


1. An early system on the Datatron 200 series.

[Listed in CACM 2(5):16 (May 1959)].
References in periodicals archive ?
If there is no gestational sac, look very carefully at the adnexa for extraovarian complexes or solid masses.
By 42 days' gestation a 2- to 3-mm gestational sac should be visible in the uterus on ultrasound.
Shavell, ultrasound showed a gestational sac and yolk sac in all cases.
Conclusion: Reduced gestational sac and embryo volumes and not yolk sac volume in women with threatened miscarriage are associated with higher risk of pregnancy loss.
Utilizing the IRP standard, a gestational sac should be seen on transvaginal sonography if the serum [beta]-hCG level is 1800 to 2000 mlU/mL.
No appreciable myometrium surrounded the gestational sac (Figures 3 and 4).
These range from endoscopic or ultrasound-guided transabdominal or transvaginal procedures such as aspiration of the gestational sac contents in the early first trimester of pregnancy and intracardiac KCl injection in the late first trimester; to umbilical cord occlusion/embolisation by various methods, intracardiac/umbilical vein injection of lethal drugs, and non-drug measures such as cardiac tamponade and heart blood aspiration at later gestations.
For the women with ongoing pregnancies and those with an empty gestational sac one week after taking the drugs, a second dose of misoprostol is now offered, which reduces the numbers of ongoing pregnancies and incomplete abortions even more.
The use of cine loops to visualin the entire gestational sac is valuable.
The first transvaginal ultrasound revealed a suspicious gestational sac without yolk sac in uterus and normal adnexal area was reported.
4) This precedes the "double decidual sign," which consists of two concentric echogenic rings: the decidua capsularis surrounding the gestational sac, and the decidua parietalis representing the opposite wall of the endometrium, often separated by a thin collection of fluid within the endometrial cavity (Figure 2).
She was 6 weeks pregnant according to her last menstruation date and had a gestational sac consistent with that gestational week.

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