**Core Concept**
Mondor's disease is a rare condition characterized by inflammation of the superficial veins, often presenting as a cord-like structure in the skin. It is a type of thrombophlebitis that affects the superficial veins.

**Why the Correct Answer is Right**
Mondor's disease is indeed a form of superficial thrombophlebitis, which involves inflammation of the vein wall due to the formation of a blood clot. The condition is often associated with trauma, surgery, or radiation therapy. The inflammation and thrombosis in the vein lead to a palpable cord-like structure under the skin, which is a hallmark of Mondor's disease.

**Why Each Wrong Option is Incorrect**
* **Option A:** Although Mondor's disease is a type of thrombophlebitis, it specifically refers to superficial thrombophlebitis, whereas the term "thrombophlebitis" can also refer to deeper vein thrombosis.
* **Option B:** Lymphatic infiltration by tumor cells is not a characteristic of Mondor's disease. This option is more relevant to conditions like Kaposi's sarcoma.
* **Option C:** While Mondor's disease does present with a cord-like appearance, this option is incomplete and does not accurately describe the condition.
* **Option D:** Mondor's disease typically affects the superficial veins in the chest, abdomen, or breast, rather than occurring all over the body.

**Clinical Pearl / High-Yield Fact**
Mondor's disease is a rare but important condition to recognize, as it can be a complication of breast surgery or radiation therapy. It is essential to diagnose and manage Mondor's disease promptly to prevent further complications.

**Correct Answer: C. Cord like apperance of subcutanous veins**