Lymph node metastasis is common in:
**Core Concept**
Lymph node metastasis is a crucial aspect of cancer spread, particularly in the context of malignancies that spread hematogenously. The process involves the invasion of cancer cells into the lymphatic vessels, which eventually drain into regional lymph nodes, facilitating the spread of cancer.
**Why the Correct Answer is Right**
The correct answer is a type of malignancy that is known to spread early to the lymph nodes. For instance, in the case of squamous cell carcinoma of the skin, the cancer cells can spread to the regional lymph nodes, including the axillary lymph nodes, even before the primary tumor reaches a significant size. This is due to the direct invasion of cancer cells into the lymphatic vessels, which is facilitated by the presence of lymphatic channels in the skin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while some types of cancer do spread to the lymph nodes, it is not a characteristic feature of this particular type of malignancy.
**Option B:** This option is incorrect because another type of cancer is more commonly associated with lymph node metastasis.
**Option C:** This option is incorrect because this type of cancer is more commonly associated with hematogenous spread, rather than lymphatic spread.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the pattern of spread (lymphatic vs. hematogenous) can provide valuable clues about the type of malignancy and its likely behavior.
**Correct Answer:** C.