The stage of Ca Endometrium with Invasion of 10 mm of Myometrium is :

**Core Concept**
The question requires knowledge of the FIGO (International Federation of Gynecology and Obstetrics) staging system for endometrial cancer, which is used to classify the extent of cancer spread. This system is crucial for determining the prognosis and treatment plan for patients with endometrial cancer.

**Why the Correct Answer is Right**
The correct answer corresponds to Stage IA1, which is characterized by the presence of cancer that has invaded the myometrium to a depth of 5 mm or less. However, the question states that the invasion is 10 mm, which corresponds to Stage IA2. This stage is further divided into IA2 (invasion 5-10 mm) and IA3 (invasion >10 mm). The correct answer should be IA2, but since that option is not available, we will consider the next closest option.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
When assessing the depth of myometrial invasion in endometrial cancer, it's essential to note that the presence of lymphovascular space invasion (LVSI) significantly impacts the prognosis and treatment plan. LVSI is associated with a higher risk of recurrence and metastasis.

**Correct Answer:** C. IA2.