Molar pregnancy
Transcript of Molar pregnancy
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Gestational Trophoblastic
Disease (GTD)
Part I : Molar Pregnancy
• Dr. Mohamed El SherbinyMD Ob.& Gyn. Senior Consultant
• Damietta, Egypt
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Part I: Molar Pregnancy
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It is a spectrum of trophoblastic diseases that includes:
Complete molar pregnancy
Partial molar pregnancies
Invasive mole
Choriocarcinoma
Placental site trophoblastic tumour
DefinitionsGestational Trophoblastic Disease (GTD)
RCOG Guideline No. 38 .2010
The last 2 may follow abortion, ectopic or normal pregnancy.
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It is a spectrum of trophoblastic diseases that develops malignant sequelae. GTN
includes:
Persistent post molar GTD
Invasive mole
Choriocarcinoma
Placental site trophoblastic tumour
DefinitionsGestational Trophoblastic Neoplasia (GTN)
=Malignant Gestational Trophoblastic Disease
Disaia &Creasman Clinical Gynecological Oncology 2007 Cunningham et al Williams Obsterics 23rd , 2010
The last 2 may follow abortion, ectopic or normal pregnancy.
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Chorio
carcinoma
I-Pathologic Classification
II-Clinical ClassificationβhCG based: WHO, FIGO, ACOG 2004 & RCOG 2010
Benign G.T.D.
G.T. Neoplasia
Malignant G.T.D.
Partial moleComplete mole
Invasivemole
MetastaticNon metastatic
Low risk High risk
Gestational Trophoblastic Disease (GTD)
Placental site trophoblastic tumour
Persistent GTD
Classifications
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Over the last 30 years major advances have taken place in our understanding and management of gestational trophoblastic disease.
1- It is now possible to diagnose a mole by
ultrasonography in minutes .
2-It became the most curable gynec. malignancy.
3-βhCG has very important role in the diagnosis, evaluation and follow up of GTN
4- The cytogenetic profile has thrown
light on the etiology of the disease .
Gestational Trophoblastic Disease
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-
Hydatidiform Mole
(H. MOLE)=
Vesicular Mole
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Hydatidiform Moles (H.M.)Hydatidiform moles are abnormal
pregnancies characterized histologically by :
Trophoblastic proliferation &Edema of the villous stroma (Hydropic) .
Based on the degree and extent of these tissue changes, hydatidiform moles are categorized as either
Complete hydatidiform mole.
Partial hydatidiform mole.
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Feature Partial mole Complete mole
Karyotype
Most commonly69, XXX or - XXY
Most commonly46, XX or -,XY
Pathology
Fetus Often present Absent
Amnion, fetal RBC Usually present Absent
Villous edema Variable, focal Diffuse
Trophoblastic proliferation Focal, slight-moderate Diffuse, slight-severe
Clinical presentation
Diagnosis Missed abortion Molar gestation
Uterine size Small for dates 50% large for dates
Theca lutein cysts Rare 25-30%
Medical complications Rare 10-25%
Postmolar CTN 2.5-7.5% 6.8-20%
Features Of Partial And Complete Hydatidiform Moles
Disaia &Creasman Clinical Gynecological Oncology 2007 Cunningham et al Williams Obsterics 23rd , 2010
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Epidemiology& Risk FactorsIncidence:USA 1/1000 South East 1/100 (Hospital)
Risk Factors:
Age: <20y (2fold) , > 40y(10 fold) & >50y (50% V.mole)
Prior Molar Pregnancy
Second molar: 1% - Third molar : 20%!
Diet:↑ in low fat Vit. A or carotene diet (complete mole)
Contraception :COC double the incidence
Previous spontaneous abortion: double the incidence
Repetitive H. moles in women with different partners
Cunningham et al,Williams Obstetrics,23 ed ,2010
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Partial moles have been linked to:• Higher educational levels• Smoking• Irregular menstrual cycles• Only male infants are among the
prior live births
Epidemiology & Risk Factors
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Karyotype
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Homozygous 90%
Pathogenesis of complete H. Mole
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Pathogenesis of complete H. Mole
Heterozygous 10%
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Pathogenesis of Partial H. Mole
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Pathology of
Molar Pregnancy
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Complete H. MoleMicroscopically Enlarged, edematous villi and abnormal trophoblastic proliferation that diffusely involve the entire villiNo fetal tissue, RBCs or amnion are produced
Macroscopically, these microscopic changes transform the chorionic villi into clusters of vesicles with variable dimensions “ like bunch of grapes" No fetal or embryonic tissue are producedUterine enlargement in excess of gestational age .Theca-lutein cyst associated in 30%
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1-Trophoblastic proliferation
2-Hydropic Degeneration
Complete hydatidiform mole: Microscopically Enlarged, edematous villi and abnormal trophoblastic proliferation that diffusely involve the entire placenta
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Complete hydatidiform mole: Macroscopically, these microscopic changes transform the chorionic villi into clusters of vesicles with variable dimensions the name hydatidiform mole stems from this "bunch of grapes"
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Complete Hydatiform Mole
Uterine wall
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Pathogenesis of
Choriocarcinoma–Aneuploidy
–(Not a multiplication of 23 chromosome )
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Partial H. MoleMicroscopically: The enlarged, edematous villi and abnormal trophoblastic proliferation are slight and focal and did not involve the entire villi.There is a scalloping of chorionic villi Fetal or embryonic or fetal RBCs
Macroscopically: The molar pattern did not involve the entire placenta.Uterine enlargement in excess of gestational age is uncommon. Theca-lutein cysts are rare Fetal or embryonic tissue or amnion
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Scalloping of chorionic villi
Partial Hydatidiform Mole
Trophoblastic proliferation are slight and focal
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Partial Hydatiform Mole
Vesicles
Maternal side
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Fetal hand demonstrating syndactyly. The fetus had a triploid karyotype, and the chorionic tissues were a partial mole
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Partial H. mole.
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The classic features areIrregular vaginal bleeding
Hyperemesis
Excessive uterine enlargement &
Early failed pregnancy.
Clinicians should check a urine pregnancy test in women presenting with such symptoms.
RCOG Guideline No. 38 ; 2010
How Do Molar Pregnancies Present To The Clinician?
Some women will present early with passage of molar tissue
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Rarer presentations include:Hyperthyroidism
Early onset pre-eclampsia
Abdominal distension due to theca lutein cysts
Very rarelyAcute respiratory failure
Neurological symptoms such as seizures (?metastatic disease).
RCOG Guideline No. 38 ; 2010
How Do Molar Pregnancies Present To The Clinician?
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What Is The Most Common Presenting Symptom Of A Complete Molar Pregnancy?
A. Hyperemesis
B. Bilateral enlarged theca lutein cysts
C. Vaginal bleeding
D. Uterine enlargement> than expected for GA
E. Pregnancy-induced hypertension
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What Is The Most Common Presenting Symptom Of A Complete Molar Pregnancy?
A. Hyperemesis 10%
B. Bilateral enlarged theca lutein cysts 30%
C. Vaginal bleeding 85%
D. Uterine enlargement> than expected for GA 40%
E. Pregnancy-induced hypertension 1%
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U/S is helpful in making a pre-evacuation
diagnosis but the definitive diagnosis is
made by histological examination.
U/S: Early detection reduced from 16 weeks
(passage of vesicles) to 12 ws
βhCG levels > 2 multiples of the median may
be of value in the diagnosis
RCOG Guideline No. 38 ; 2010
How Is Complete Mole Diagnosed?
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U/S& βhCG
Definite diagnosis on first U/S
examination
U/S alone: 68%
U/S + βhCG > threshold of
82,350 mIU/mL: 89%
Disaia &Creasman Clinical Gynecological Oncologym 7th edd. 2007
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TVS “Milestones” Versus βhCG hCG mIU/mL Weeks
Detection Level >5 3-4
Choriodecidual thickening 100 4
Gestational sac (D Zone) 1000 -1500 4-5
Yolk sac 7000 5- 6
Heart motion 10,000 6
Embryonic Movem. > 10.000 6- 7 Maximum level 50,000to 100,000 8-10
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Complete Molar Pregnancy
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Complete hydatidiform mole. The classic "snowstorm" appearance is created by the multiple placental vesicles.
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Complete H.Mole (High-resolution) U/S Complex intrauterine mass containing many small cysts.
Complete H.Mole Associated theca-lutein cysts. U/S Power Doppler
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In most patients with a partial mole,
the clinical and U/S diagnosis is
Usually missed or incomplete abortion.
This emphasizes the need for a
thorough histopathologic evaluation of
all missed or incomplete abortions
How Is Partial H .Mole Diagnosed?
Disaia &Creasman Clinical Gynecological Oncologym 7th edd. 2007
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Classically: A thickened, hydropic placenta with fetal or embryonic tissue
Multiple soft markers, including:
Cystic spaces in the placenta and
Transverse to AP dimension a ratio of the gestation sac of > 1.5, is required for the reliable diagnosis of a partial molar pregnancy
RCOG Guideline No. 38 ; 2010
How Is Partial H .Mole Diagnosed?
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Partial Molar Pregnancies
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A 24-year-old 2nd Gravida ,Para 1 woman at 8 Ws
GA (Blood group: O, negative) complains of:
1-Worsening nausea, and vomiting over the last
2 weeks which is unlike her prior pregnancy .
2-Irregular vaginal bleeding over the last 7 days
She denies any abdominal or back cramps.
What does the differential diagnosis include for
this patient?
Case Scenario 1
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The differential diagnosis of bleeding with early pregnancy and progressive vomiting are:
Multiple pregnancy.
Hydatidiform mole.
Threatened abortion.
Ectopic pregnancy.
What Does The Differential Diagnosis
Include For This Patient?
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The most useful diagnostic test is :
U/S
Which Diagnostic Test Would Be Most Useful?
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Complex intrauterine mass containing many small cysts (Snowstorm appearance)
What is the most likely diagnosis?
Hydatidiform (Vesicular) mole
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What Would One Expect To See At Scan If Her Pregnancy Is Normal?
Gestational (Chorionic) Sac
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What Is The Ultrasonogaphic
Differential Diagnosis For This Case?
U/S DD :1-Missed
abortion
2-Degenerated fibroid
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Differential Diagnosis: Long standing missed abortion
with cystic degeneration of the placenta
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β subunit hCG
Then
1-What is the most likely diagnosis?
2-How can the patient be managed?
What Is The Recommended Subsequent Test ?
The B subunit hCG assay:
195,000 mlU/mL
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1-What Is The Most Likely Diagnosis?
The snowstorm pattern on U/S&
The abnormally high hCG level
are diagnostic of
Vesicular Mole
Probably complete V. mole
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Why It Is Probably Complete V. Mole?
It demonstrates the typical U/S appearance of complete V. mole :
a complex, echogenic intrauterine mass containing many small cystic spaces.
Fetal tissues and amnionic sac are absent
However the final differentiation is after histopathology.
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There are 2 important basic lines :
1-Evacuation of the mole
2-Regular follow-up to detect
persistent trophoblastic disease
If both basic lines are done
appropriately, mortality rates can be
reduced to zero.
What Is The Plan of Management?
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What Is The Best Method Of Evacuating This Molar Pregnancy?
A. Cervical priming with misoprostol then suction
evacuation
B. Suction evacuation to be repeated 1-2 weeks later
C. Single suction evacuation
D. Medical trial with misoprostol &oxytocine before
suction
C.
What Is The Evidence ?
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The Management Of Gestational Trophoblastic Disease
RCOG Guideline No. 38 ; 2010
What Is The Evidence ?
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For Complete mole is: Suction curettage
Cervical preparation with prostaglandins or misoprostol , should be avoided to reduce the risk of embolisation (No sufficient studies)
RCOG Guideline No. 38 ; 2010
What Is The Best Method Of Evacuating A Molar Pregnancy?
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For Partial mole: It depends on the fetal partsSmall fetal parts :Suction curettageLarge fetal parts: Medical (oxytocics)
In partial mole the oxytocics is safe ,as the hazard to embolise and disseminate trophoblastic tissue is very low
Also, the needing for chemotherapy is 0.1- 0.5%.
RCOG Guideline No. 38 ; 2010
Is That The Same For Partial Mole?
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• The use of oxytocic infusion prior to completion of the evacuation is not recommended (fear of embolisation).
• If the woman is experiencing significant haemorrhage prior to evacuation, surgical evacuation should be expedited and the need for oxytocin infusion weighed up against the risk of tumour embolisation.
RCOG Guideline No. 38 ; 2010
Can Oxytocic Infusions Be Used During Surgical Evacuation?
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Histological examination is indicated in:Failed pregnancies (missed or molar) :All medically or surgical managed cases
Products of conception, obtained after all repeat evacuations (post abortive or p.partum)
There is no need after therapeutic termination : provided that fetal parts is identified on U/S
RCOG Guideline No. 38 ; 2010
Should Products Of Conception Be Examined Histologically?
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Return to Case Scenario 1
Suction curettage has been performed using 10mm canula under U/S guidance
10mm
Canula up to a maximum of 12 mm, is usually sufficient to evacuate all complete molar pregnancies.
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Other seats of suction curettage
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Suction curettage has been performed using 10mm canula under U/S guidance :
El SHERBINY HOSPEl SHERBINY HOSP
Canula
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Suction curettage can be
performed under U/S
guidance to:
Facilitate the procedure
Confirm complete
evacuation of contents. Garner UpToDate 2010
U/S Guided Suction Curettage
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The Molar Content For Histopathological Examination
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Meticulous histopathological examination revealed: Villi have extensive stromal edemaAbnormal trophoblastic proliferation No embryonic or fetal tissue or RBCs
These findings are diagnostic of:Complete Hydatidiform Mole
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The Case is Now Confirmed Histopathological As A Complete H. Mole What Is The Most Appropriate Management?
A- Surveillance :Weekly then monthly βhCG
B-Hysterectomy
C-Transvaginal U/S examination
D-Repeated curettage &Biopsy
E-Prompt chemotherapy
A.
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Hysterectomy may be preferred to suction curettage at age ≥ 40 with no desire for further pregnancies especially with other risk factors for GTN as :
Large theca lutein cysts( >6 cm) Significant uterine enlargement Pretreatment βhCG ≥ 105. Although hysterectomy does not eliminate
possibility of GTN this, it markedly reduces its likelihood.
Garner UpToDate 2010 Soper. Obstet Gynecol 108:176, 2006
Cunningham et al,Williams Obstetrics,23 ed ,2010
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Complete H. Mole After Hysterectomy
Complete H. Mole with large for date uterus& Theca-lutein cyst
Patient was 42 years 5th G P5 initial BhCG:195,000mIU/mL
Complete H. Mole After Hysterectomy
Complete H. Mole with large for date uterus& Theca-lutein cyst
Patient was 42 years 5th G P5 initial BhCG:195,000mIU/mL
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Theca-lutein cyst associated with a complete H. mole in >30%
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Prophylactic Chemotherapy: The long-term prognosis for women with a H. mole is not improved with prophylactic chemotherapy. Because toxicity—including death—may be significant, it is not recommended routinely *
It may be useful in the high-risk cases when follow-up are unavailable or unreliable. * *
Second Uterine Evacuation :There is no clinical indication for the routine use of second uterine evacuation
RCOG Guideline No. 38 ; 2010
American College of Obstetricians and Gynecologists, 2004*
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When Anti-D Is Required?
It is required in partial due to the
presence of fetal RBCs
In complete mole: if diagnosis is not
confirmed histopathologically
RCOG Guideline No. 38 ; 2010
Is Anti-D Prophylaxis Required For This Case?
No
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Post-evacuation Surveillance
Why?
To determine when pregnancy
can be allowed
To detect persistent
trophoblastic disease (i.e. GTN)
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A baseline serum β -hCG level is obtained within 48 hours after evacuation.
Levels are monitored every 1 to 2 weeks
while still elevated to detect persistent
trophoblastic disease (GTN).
These levels should progressively fall to an undetectable level (<5 mu/ml).
If symptoms are persistent, more frequent β hCG estimation and U/S examination ± D&C are advised
RCOG Guideline No. 38 ; 2010
The Post-evacuation Surveillance. How?
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Cunningham et al,Williams Obstetrics,23 ed ,2010
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Cunningham et al,Williams Obstetrics,23 ed ,2010
The Scenario case
At the 9 week follow up the β hCG level : 2u/L
Is this level sufficient to stop follow up ?
No
4-
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A. For 6 months from the date of uterine
evacuation.
B. For 6 months from normalization of the β hCG
level.
C. For 12 months from the date of uterine
evacuation.
What Is The Optimum Follow-up Period Following Normalization of β hCG?
B
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It depends upon when hCG has reverted to normal ≤ 56 days of the pregnancy event: Follow up is
6 months from the date of uterine evacuation. >56 days of the pregnancy event :Follow up is
6 months from normalization of the hCG level.
RCOG Guideline No. 38 ; 2010
What Is The Optimum Follow-up Period After Which Pregnancy Is Allowed?
At this period levels of βhCG are monitored every month
Practically once βhCG has normalized after molar evacuation, the possibility of GTN developing is very low.
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Barrier methods until normal β hCG level.
Once βhCG level have normalized:Combined
oral contraceptive (COC ) pill may be used.
If oral COC was started before the diagnosis of
GTD ,COC can be continue as its potential to
increase risk of GTN is very low
IUCD should not be used until β hCG levels are
normal to reduce uterine perforation.
What Is Safe Contraception Following GTD?
RCOG Guideline No. 38 ; 2010
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A 34-year-old woman, married for 7 years
3rd Gravida ,Para 0 at 14 Ws GA.
The previous abortions were at 7&8 weeks.
She complains of:
1-Mild vaginal bleeding for 4 days
2-Nausea, and moderate vomiting
Pulse 95/m, Bp 140/85
Case Scenario 2
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What Is The U/S Differential Diagnosis?
US scanning revealed
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Complete mole with a coexisting
normal twin
Partial mole
Other placental abnormalities
Rtroplacental hematoma
Degenerating myoma
What Is The U/S Differential Diagnosis?
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Quantities serum β hCG
Free T4
Protein in urine
Rescanning after one week in a
tertiary or fetal medicine center for
diagnosis & screening.
What Are The Required Investigations?
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β hCG :80,000 mµ/ml
Free T4 : 2µg/ml (N 0.3-1.7µg/ml)
Protein in urine: Negative
U/S Tertiary center report: Molar pregnancy with a coexisting normal
twinThe mole is mostly complete ,to be
confirmed histopathologicaly (After termination).
U/S Fetal screening: No detectable anomalies
Follow up is recommended .
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1-Counseling for the increased risk of perinatal morbidity :
• Bleeding
• Pre-eclampsia5-20%
• Hyperthyrodism 5%
• premature labor 35%
• Early fetal loss 40%
• Live birth only :25%.
2-Counseling for the increased risk of GTN outcome and need of serial surveillance .
How Cane We Council The Couple?
RCOG Guideline No. 38 ; 2010
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Garner UpToDate ,2010
The Patients Elects To Continue The Pregnancy. How Can We Manage?
Close maternal surveillance for development of preeclampsia or hyperthyroidism.Fetal karyotype may be considered if follow up screening is not assuringSerial hCG level for detection of GTN. A chest x-ray to exclude pulmonary metastases (choriocarcinoma)Postpartum: the placenta should be sent for evaluation by a pathologist
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Development of preeclampsia or
hyperthyroidism.
Fetal karyotype is not normal dioploidy
β hCG level levels consistent with GTN.
Evidence of metastases (choriocarcinoma)
Accidental hemorrhage
Garner UpToDate ,2010
When Must Pregnancy Be Terminated ?
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Thank You
Thank You
Egypt