**Core Concept**
Synovial sarcoma is a type of malignant soft tissue tumor that typically arises near the joints of the arm, neck, or leg. It is characterized by its unique histological and immunohistochemical features, which can aid in diagnosis.

**Why the Correct Answer is Right**
Synovial sarcoma is known for expressing specific cellular markers that can help distinguish it from other types of tumors. The most commonly associated markers include epithelial membrane antigen (EMA), cytokeratins (CK), and vimentin. These markers are often used in conjunction with other diagnostic tools, such as morphology and molecular genetics, to confirm the diagnosis of synovial sarcoma.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not mention any of the commonly associated markers with synovial sarcoma.

**Option B:** This option is incorrect because it is incomplete and does not provide any specific information about cellular markers.

**Option C:** This option is incorrect because it lists markers that are more commonly associated with other types of tumors, such as Ewing's sarcoma (CD99) or rhabdomyosarcoma (desmin).

**Clinical Pearl / High-Yield Fact**
When considering the diagnosis of synovial sarcoma, it is essential to remember that this tumor often expresses a combination of epithelial and mesenchymal markers, which can help differentiate it from other types of soft tissue tumors.

**Correct Answer:** B. EMA, CK, and vimentin.