Definition

1. Noun:
   • A type of malignant bone tumor: "Endothelial myeloma" is a medical term for a specific, rare, and aggressive cancerous tumor that originates in the bone marrow. It is characterized by the proliferation of abnormal cells derived from the endothelium within the marrow cavity.

Usage

• The term "endothelial myeloma" is used almost exclusively in specialized medical, pathological, and oncological contexts to diagnose and classify a specific bone cancer.
• It typically refers to tumors found in locations such as the pelvis or the long bones of the body (e.g., femur, tibia).

Examples

• Noun:
  • The biopsy confirmed a diagnosis of endothelial myeloma.
  • Treatment for endothelial myeloma often involves a combination of chemotherapy and radiation.

Advanced Usage

• In clinical pathology, "endothelial myeloma" may be discussed in relation to its histological features under a microscope.
• The term may appear in differential diagnoses when a patient presents with bone pain and a destructive lesion on imaging.

Variants and Related Words

• Ewing's sarcoma: This is the more common contemporary name for the condition historically or alternatively referred to as "endothelial myeloma." The two terms are often used synonymously in medical literature.
• Bone marrow tumor: A broader, descriptive term.
• Primary bone cancer: A general category that includes endothelial myeloma/Ewing's sarcoma.

Synonyms

• Ewing's sarcoma (primary synonym)
• Ewing sarcoma
• Peripheral primitive neuroectodermal tumor (pPNET) of bone (a related classification)

Notes on Meaning

• The term is highly technical. The "endothelial" component suggests an origin from endothelial (lining) cells within blood vessels in the marrow, while "myeloma" indicates a tumor of the bone marrow. However, modern classification places this tumor in the Ewing sarcoma family.
• It is crucial to distinguish this from multiple myeloma, which is a different type of cancer also originating in bone marrow but involving plasma cells.

Noun

1. malignant tumor in bone marrow (usually in the pelvis or in long bones)