Vesicular Mole (Hydatidiform Mole)

INTRODUCTION

• Vesicular mole is a benign form of Gestational Trophoblastic Disease (GTD) resulting from abnormal fertilization. It is characterized by:

• Proliferation of trophoblastic tissue

• Edematous swelling of chorionic villi

• Formation of multiple cystic structures (grape-like vesicles)

It is important because it can progress to malignant conditions like choriocarcinoma.

DEFINITION

A hydatidiform mole is an abnormal pregnancy in which there is degeneration of chorionic villi with trophoblastic proliferation, leading to a mass of vesicles and absence or abnormal development of the fetus.

ETIOLOGY / CAUSES

Exact cause is unknown, but associated factors include:

1️⃣Genetic Causes

• Abnormal fertilization:

• Empty ovum fertilized by one sperm (duplicates) → Complete mole

• Normal ovum fertilized by two sperms → Partial mole

2️⃣Risk Factors

• Extremes of maternal age (<20 years or >35–40 years)

• Previous molar pregnancy (↑ recurrence risk)

• Nutritional deficiency (low carotene, folic acid, protein)

• Low socioeconomic status

• Asian countries have higher incidence

• History of infertility

TYPES OF HYDATIDIFORM MOLE

A. Complete Mole

B. Partial Mole

DIFFERENCE BETWEEN COMPLETE AND PARTIAL MOLE

CLINICAL MANIFESTATIONS

1️⃣Early Symptoms

• Irregular vaginal bleeding (dark brown/bright red)

• Passage of vesicles (grape-like)

• Amenorrhea followed by bleeding

2️⃣General Symptoms

• Excessive nausea and vomiting (hyperemesis)

• Weakness, anemia

• Abdominal pain

3️⃣Physical Findings

• Uterus larger than expected (complete mole)

• No fetal movements or heart sounds

• Soft uterus

4️⃣Associated Features

• Early Pregnancy-Induced Hypertension (PIH)

• Signs of hyperthyroidism:

• Tachycardia

• Sweating

• Tremors

COMPLICATIONS

Immediate Complications

• Severe hemorrhage

• Infection

• Shock

Late Complications

• Persistent trophoblastic disease

• Invasive mole

• Choriocarcinoma (malignant tumor)

• Pulmonary embolism

Other Complications

• Anemia

• Theca lutein ovarian cysts

• Thyrotoxicosis

DIAGNOSIS EVALUATION

• Clinical features → Vaginal bleeding, enlarged uterus, no fetal heart sound

• β-hCG level → Markedly increased

• Ultrasound (USG) → “Snowstorm appearance”, no fetus (complete mole)

• Histopathology → Confirmatory

  
  

💊 Management

1. Evacuation of Mole

• Suction evacuation (preferred method)

• Dilatation & Curettage (D&C)

2. Supportive Care

• IV fluids

• Blood transfusion (if needed)

• Oxytocin to control bleeding

3. Follow-Up (Most Important)

• Serial β-hCG monitoring

• Weekly → until normal

• Monthly → for 6–12 months

• Avoid pregnancy during follow-up

• Use contraception (OCPs)

4. If Complications

• Chemotherapy (e.g., Methotrexate)

• Hysterectomy (selected cases)

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Here’s a short “exam trick” version for Vesicular Mole (Hydatidiform Mole) — super quick points you can remember .

Introduction

Abnormal pregnancy with trophoblastic overgrowth and swollen villi forming grape-like vesicles.

Definition

A condition where chorionic villi degenerate and proliferate, forming cysts with absent/abnormal fetus.

Types

Complete mole

Partial mole

Difference (Key Points)

• Complete → No fetus, very high hCG, high malignancy risk

• Partial → Abnormal fetus present, moderate hCG, low risk

  
  

Causes / Risk Factors

• Abnormal fertilization

• Extremes of maternal age

• Previous molar pregnancy

• Poor Nutrition

  
  

Clinical Manifestations

• Vaginal bleeding

• Grape-like vesicles

• Uterus ↑ size

• No fetal heart sound

• Severe vomiting

  
  

Complications

• Hemorrhage

• Infection

• Choriocarcinoma

• Anemia

  
  

Diagnosis / Evaluation

• USG → Snowstorm appearance

• β-hCG → Very high

• Histopathology → Confirm

  
  

Management

• Suction evacuation (main treatment)

• IV fluids, blood transfusion

• Oxytocin

Follow-Up (Very Important)

• Serial β-hCG monitoring

• Avoid pregnancy for 6–12 months

• Use contraception

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🚀Here’s a set of 07 MCQs on Vesicular mole for practice:

1️⃣Vesicular mole is a type of:

A. Ectopic pregnancy

B. Gestational trophoblastic disease

C. Abortion

D. Placenta previa

✅ Answer: B

2️⃣ The most common symptom of vesicular mole is:

A. Fever

B. Vaginal bleeding

C. Headache

D. Edema

✅ Answer: B

3️⃣Characteristic ultrasound finding in vesicular mole is:

A. Honeycomb pattern

B. Snowstorm appearance

C. Ring sign

D. Double bubble sign

✅ Answer: B

4️⃣ In complete mole, the fetus is:

A. Normal

B. Absent

C. Dead

D. Premature

✅ Answer: B

5️⃣ β-hCG levels in vesicular mole are:

A. Low

B. Normal

C. Slightly increased

D. Very high

✅ Answer: D

6️⃣The treatment of choice for vesicular mole is:

A. Antibiotics

B. Suction evacuation

C. Cesarean section

D. Bed rest

✅ Answer: B

7️⃣A serious complication of vesicular mole is:

A. Diabetes

B. Hypertension

C. Choriocarcinoma

D. Asthma

✅ Answer: C