The current imaging technique of choice for the diagnosis of hydatidiform mole is :
**Core Concept**
The diagnosis of hydatidiform mole requires an imaging technique that can accurately visualize the uterine cavity and detect the characteristic features of the mole. This involves identifying the presence of a mass with a "snowstorm" appearance, uterine enlargement, and the absence of a visible fetus.
**Why the Correct Answer is Right**
Ultrasound is the current imaging technique of choice for diagnosing hydatidiform mole due to its non-invasive nature, high sensitivity, and specificity. It allows for the visualization of the uterine cavity, the mass, and its characteristic features. Doppler ultrasound can also detect blood flow within the mass, which is often increased in hydatidiform mole. The "snowstorm" appearance on ultrasound is due to the presence of numerous small vesicles within the uterine cavity.
**Why Each Wrong Option is Incorrect**
**Option A:** MRI is not typically used for the initial diagnosis of hydatidiform mole due to its higher cost and limited availability compared to ultrasound.
**Option B:** X-rays are not useful for diagnosing hydatidiform mole as they do not provide sufficient detail of the uterine cavity and can be affected by the presence of calcifications within the mole.
**Option C:** CT scans are not typically used for the diagnosis of hydatidiform mole due to radiation exposure and the availability of safer imaging modalities like ultrasound.
**Clinical Pearl / High-Yield Fact**
It is essential to note that ultrasound is not only used for diagnosis but also for monitoring the resolution of the mole after evacuation. Regular follow-up ultrasounds can help detect any complications, such as persistent gestational trophoblastic neoplasia.
**Correct Answer: C. USG (Ultrasound).**