Which is the characteristic feature of molar pregnancy diagnosed in sonography?

Raj. CHO -2025

Obstetrics & Gynaecology

Easy

Appeared in: Raj. CHO -2025

Explanation

The classic sonographic sign of a complete molar pregnancy is the 'snow storm' appearance.
This pattern is created by an echogenic uterine mass composed of numerous small, anechoic (fluid-filled) cystic spaces, which correspond to the swollen (hydatidiform) chorionic villi.
In a complete mole, there are typically no fetal parts or a normal amniotic sac visible on the ultrasound, distinguishing it from a partial mole or a non-molar pregnancy.

Option A: Fibroids (leiomyomas) are benign tumors of the uterine muscle (myometrium), not abnormal pregnancies. On ultrasound, they typically appear as well-defined, solid, hypoechoic (darker) masses, which is distinct from the cystic, echogenic appearance of a mole.
Option B: This describes the macroscopic or gross appearance of the molar tissue after it is passed from the uterus or removed via curettage. It is what the tissue looks like to the naked eye, not its appearance on an ultrasound image.
Option D: This is an administrative option related to test-taking and does not represent a clinical finding or diagnosis. In a clinical context, this option is irrelevant.

Visual 1: Ultrasound Image - An ultrasound image showing the characteristic 'snow storm' pattern of a complete molar pregnancy within the uterine cavity. The caption should point out the diffuse echogenic tissue and multiple small anechoic cysts.
Visual 2: Gross Specimen Photograph - A photograph of an evacuated molar pregnancy specimen, clearly demonstrating the 'grape-like' vesicles. The caption should explain that this is the macroscopic appearance, distinct from the sonographic view.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Sonographic diagnosis of molar pregnancy as background academic context rather than a clinical decision trigger.
Accurate sonographic diagnosis is crucial for prompt management, typically suction curettage, to prevent complications like severe hemorrhage, uterine perforation, and early-onset pre-eclampsia.
Post-evacuation monitoring of serum hCG levels is mandatory to detect persistent trophoblastic disease or malignant transformation into gestational trophoblastic neoplasia (GTN), such as choriocarcinoma.
What if the ultrasound showed a fetus alongside molar-appearing placental tissue? This would suggest a partial mole, which has a different genetic makeup (usually triploid) and a lower, though still present, risk of malignant transformation compared to a complete mole.

How to Approach the Question

First, identify the key terms in the question: 'molar pregnancy' and 'sonography'. This tells you the question is about an imaging finding for a specific type of abnormal pregnancy.
Next, analyze the options provided. You need to differentiate between terms that describe imaging findings versus terms that describe gross pathology or other conditions.
Recall or deduce the difference between 'snow storm appearance' and 'grape-like appearance'. 'Snow storm' is a classic descriptor for the diffuse, vesicular pattern seen on an ultrasound screen.
'Grape-like' describes the physical appearance of the tissue itself, which is seen after it's removed, not on the ultrasound.
Eliminate 'Fibroids' as it is a different type of uterine pathology with a distinct sonographic appearance (solid mass).
Eliminate 'Question not attempted' as it is not a medical finding. This leaves 'Snow storm appearance' as the only correct sonographic feature.

Concept Tested & Keywords

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