Zonary placenta
Last revised by David Luong
on 6 Feb 2022
Citation, DOI, disclosures and article data
Citation:
Weerakkody Y, Luong D, Zonary placenta. Reference article, Radiopaedia.org (Accessed on 13 Dec 2024) https://doi.org/10.53347/rID-92241
Permalink:
rID:
92241
Article created:
Disclosures:
At the time the article was created Yuranga Weerakkody had no recorded disclosures.
View Yuranga Weerakkody's current disclosures
Last revised:
6 Feb 2022,
David Luong
Disclosures:
At the time the article was last revised David Luong had no recorded disclosures.
View David Luong's current disclosures
Revisions:
3 times, by
2 contributors -
see full revision history and disclosures
Synonyms:
- Ring shaped placenta
- Annular placenta
A zonary placenta also known as a ring-shaped placenta or annular placenta is an extremely rare variation in placental morphology where the placenta can appear as an annular ring. It can be a complete ring of placental tissue, but more often, tissue atrophy to part of the ring can result in a horseshoe shape placenta.
Epidemiology
Reported incidence is less than 1 in 6000 1.
Complications
The ring-shaped placenta can cause antepartum and postpartum bleeding, as well as fetal growth restriction 3.
References
- 1. Živković N, Krezo S, Matijević R, Živković K. Vaginal delivery through annular placenta -- case report. (2013) Croatian medical journal. 54 (2): 203-5. doi:10.3325/cmj.2013.54.203 - Pubmed
- 2. Steemers NY, De Rop C, Van Assche A. Zonary placenta. (1995) International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics. 51 (3): 251-3. doi:10.1016/0020-7292(95)80020-4 - Pubmed
- 3. Kimberly M. Rathbun, Jason P. Hildebrand. Placenta Abnormalities. (2020) Pubmed
Incoming Links
Articles:
Related articles: Pathology: Genitourinary
- obstetrics
-
first trimester
- ultrasound findings in early pregnancy
- embryo/fetus
- beta-hCG levels
- confirming intrauterine gestation
- pregnancy of unknown location (PUL)
- first trimester vaginal bleeding
- early structural scan
- aneuploidy testing
-
second trimester
- fetal biometry
- amniotic fluid volume
- fetal morphology assessment
- soft markers
- amnioreduction
- Doppler ultrasound
- nuchal translucency
- 11-13 weeks antenatal scan
- chorionic villus sampling (CVS) and amniocentesis
- other
- placenta
- placental anatomy
- placental developmental abnormalities
- placenta previa
- spectrum of abnormal placental villous adherence
- abnormalities of cord insertion
- abruptio placentae
- placental pathology
- vascular pathologies of placenta
- placental infections
- placental masses
- molar pregnancy
- twin placenta
- miscellaneous
-
first trimester
- gynecology
- acute pelvic pain
- chronic pelvic pain
- uterus
- ovaries
- ovarian follicle
- ovarian torsion
- pelvic inflammatory disease
- ovarian cysts and masses
- paraovarian cyst
- polycystic ovaries
- ovarian hyperstimulation syndrome
- post-hysterectomy ovary
- cervix
- fallopian tube
- other
- male genital tract
- prostate gland
- transrectal ultrasound
- prostate tumors
- infections of the prostate
-
prostatitis
- acute bacterial prostatitis
-
chronic prostatitis
- chronic bacterial prostatitis
- chronic prostatitis and chronic pelvic pain syndrome (CPPS)
- asymptomatic inflammatory prostatitis
- granulomatous prostatitis
- emphysematous prostatitis
- prostatic abscess
-
prostatitis
- benign prostatic hypertrophy
- cystic lesions of the prostate
- prostatic calcification
- prostatic infarction
- testes
-
unilateral testicular lesion
- testicular torsion
- orchitis
- testicular trauma
-
germ cell tumors of the testis
- testicular seminoma
-
non seminomatous germ cell tumors
- mixed germ cell tumor
- yolk sac tumor (endodermal sinus tumor)
- embryonal cell carcinoma
- choriocarcinoma
- testicular teratoma
- testicular epidermoid (teratoma with ectodermal elements only)
- burned out testis tumor
- sex cord / stromal tumors of the testis
- testicular cyst
- testicular lymphoma
- bilateral testicular lesion
- paratesticular lesions
- epididymis
- other
- polyorchidism
- cryptorchidism
- tubular ectasia of the rete testis
- cystadenoma of the rete testis
- testicular sarcoidosis
- testicular tuberculosis
- spermatic cord
- fibrous pseudotumor of the scrotum
- scrotal leiomyosarcoma
- testicular adrenal rest tumors (TARTs)
- tunica vaginalis testis mesothelioma
- splenogonadal fusion
- testicular vasculitis
- abnormal testicular Doppler flow (differential)
-
unilateral testicular lesion
- penis
- prostate gland
- KUB
- kidneys
- normal renal anatomy
- hydronephrosis
- urolithiasis
- renal masses
- renal cystic disease
- renal infection
- vascular
- trauma
- ureter
- normal ureter anatomy
- ureteral stricture
- ureteral dilatation
- ureteral anomalies
- ureteral tumors
- ureteral trauma
- other
- bladder
- kidneys
Unable to process the form. Check for errors and try again.