**Core Concept**
Incomplete uterine rupture refers to a partial disruption of the uterine scar, which may not necessarily involve the entire thickness of the uterine wall. This type of rupture can occur in women with a history of previous cesarean delivery or uterine surgery, often due to uterine distension or contractions.

**Why the Correct Answer is Right**
The correct answer, **D. Disruption of scar with peritoneum intact**, is accurate because an incomplete uterine rupture involves only the uterine scar itself, without extension into the peritoneal cavity. This means that the peritoneum, a layer of tissue that lines the abdominal cavity, remains intact. In contrast, a complete uterine rupture would involve the entire thickness of the uterine wall, including the peritoneum.

**Why Each Wrong Option is Incorrect**
**Option A:** Disruption of part of scar is incorrect because it is too vague and does not specify the involvement of the peritoneum. Incomplete rupture can involve any part of the scar, not just a specific portion.

**Option B:** Disruption of entire length of scar is incorrect because it describes a complete uterine rupture, which involves the entire thickness of the uterine wall, including the peritoneum.

**Option C:** Disruption of scar including peritoneum is incorrect because it describes a complete uterine rupture, which is a more severe condition than incomplete rupture.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that incomplete uterine rupture can be a "silent" condition, as it may not always be accompanied by symptoms such as severe abdominal pain or vaginal bleeding. Therefore, women with a history of previous uterine surgery should be closely monitored during pregnancy and labor for any signs of uterine rupture.

**✓ Correct Answer: D. Disruption of scar with peritoneum intact**