In Browne’s classification of placenta pre, the placenta covers the internal os when closed but not when fully dilated is:
**Core Concept**
Browne's classification categorizes placenta previa based on the placental location and its relation to the internal cervical os. This classification is essential in understanding the clinical implications and management of placenta previa.
**Why the Correct Answer is Right**
In Browne's classification, **Type 2** placenta previa is characterized by the placenta covering the internal os when the cervix is closed but not when it is fully dilated. This is due to the fact that the placenta is partially covering the internal os, and as the cervix dilates, the placenta is pushed away from the os, exposing it.
**Why Each Wrong Option is Incorrect**
**Option A:** This option does not specify the characteristics of Browne's classification, making it an incorrect choice.
**Option B:** This option is not part of Browne's classification and is therefore incorrect.
**Option C:** This option might be a characteristic of another classification system, but it is not relevant to Browne's classification.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that Browne's classification is based on the placental location and its relation to the internal cervical os. This classification helps in determining the severity and management of placenta previa.
**Correct Answer:** C.