The snow storm appearance of the uterus in USG indicates the presence of?

HPSSC - 2015

Obstetrics & Gynaecology

Easy

Appeared in: HPSSC - 2015

Explanation

The 'snowstorm' appearance on ultrasound is the hallmark sign of a hydatidiform mole.
This pattern is created by numerous, edematous, and cystic chorionic villi that fill the uterine cavity.
In a complete mole, which this appearance typically represents, there is diffuse trophoblastic proliferation without any fetal tissue.
Clinically, this finding is often accompanied by significantly elevated serum β-hCG levels.

Option A: Hydramnios refers to an excessive volume of amniotic fluid. On ultrasound, this appears as a large anechoic (black) space surrounding a fetus, not a solid or cystic mass with a 'snowstorm' texture.
Option B: An ectopic pregnancy involves implantation outside the uterine cavity. The classic ultrasound finding is an empty uterus with an adnexal mass, sometimes with a yolk sac or embryo visible outside the uterus.
Option D: A fibroid (leiomyoma) is a benign tumor of the uterine muscle. On ultrasound, it appears as a well-defined, solid, hypoechoic mass within the myometrium, which is distinct from the 'snowstorm' pattern of a molar pregnancy that fills the endometrial cavity.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Sonographic diagnosis of hydatidiform mole as background academic context rather than a clinical decision trigger.
Nurses must be prepared for the immediate management of a patient diagnosed with a hydatidiform mole, which includes preparing for suction evacuation, ensuring IV access, and having blood products available due to the high risk of hemorrhage.
Post-evacuation care involves monitoring vital signs, assessing for vaginal bleeding, and managing potential complications like preeclampsia or thyrotoxicosis, which can occur due to extremely high hCG levels.
Patient education is a critical nursing role. The nurse must explain the importance of strict follow-up with serial β-hCG testing and the need for reliable contraception for 6-12 months to avoid a new pregnancy that would interfere with monitoring for malignant GTN.

How to Approach the Question

First, identify the key phrase in the question stem: 'snow storm appearance of the uterus in USG'. This is a classic, pathognomonic sign.
Recall or look up the typical ultrasound findings for the conditions listed in the options.
Match the 'snowstorm' description to the correct pathology. This appearance is uniquely associated with the cystic, swollen villi of a hydatidiform mole.
Analyze the provided image. Observe the diffuse, bright (echogenic) material with multiple dark (anechoic) spots, which visually confirms the 'snowstorm' pattern, strengthening the diagnosis.
Eliminate the other options by contrasting their expected USG findings: Hydramnios is excess fluid (black), an ectopic pregnancy shows an empty uterus, and a fibroid is a solid mass in the uterine wall.

Concept Tested & Keywords

Concept Tested: Sonographic diagnosis of hydatidiform mole
Stem keywords: snow storm appearance, uterus, USG
Lead-in keywords: indicates the presence of
Clinical cues: The phrase 'snow storm appearance' is a classic descriptor for a specific pathology on ultrasound.

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