Conventional Chordoma

**Semantic type:** Neoplastic Process

**Definition:** A malignant bone tumor arising from the remnants of the fetal notochord. It is characterized by the presence of large epithelioid cells with clear to light eosinophilic cytoplasm. Some of the cells are large with bubbly, vacuolated cytoplasm (physaliphorous cells). The cells form cords and nests that are embedded within an extracellular myxoid matrix.