**Core Concept**
The anterior mediastinum is a region in the thoracic cavity that contains structures such as the thymus gland, lymph nodes, and sometimes ectopic thyroid tissue. Tumors in this region can arise from these structures or be metastatic from other sites. Understanding the typical location of various tumors is crucial for accurate diagnosis and treatment.

**Why the Correct Answer is Right**
The anterior mediastinum is typically associated with tumors such as thymic carcinomas, lymphomas, and germ cell tumors, including teratomas and seminomas. These tumors arise from the thymus gland or lymphoid tissues, which are predominantly located in the anterior mediastinum.

**Why Each Wrong Option is Incorrect**
* **Option A:** Although not the most common location, tumors like non-Hodgkin lymphoma can occur in the anterior mediastinum, making this option incorrect.
* **Option B:** Thymic carcinomas are a type of tumor that typically arises in the anterior mediastinum, so this option is also incorrect.
* **Option D:** Germ cell tumors, including teratomas and seminomas, are commonly found in the anterior mediastinum, making this option incorrect as well.

**Clinical Pearl / High-Yield Fact**
The anterior mediastinum is the most common location for thymic carcinomas and is often associated with anterior mediastinal masses in young adults. A high index of suspicion for thymoma or thymic carcinoma should be maintained in patients presenting with anterior mediastinal masses.

**Correct Answer: C. Cystic hygroma is typically seen in the posterior mediastinum.**