A 15-Year-Old Boy Is Brought to the Emergency Department Due

question 207

Multiple Choice

A 15-year-old boy is brought to the emergency department due to hemoptysis.  He has a history of amputation of the right lower extremity for "bone cancer" in Mexico.  Chest imaging reveals a lung mass.  Excisional biopsy of the mass shows sheets of uniform, small (slightly larger than lymphocytes) , round cells with scant, clear cytoplasm.  The cellular deposits are interrupted by vascular fibrous septae, with areas of hemorrhage and an abrupt transition from viable to necrotic cells.  A representative sample is shown in the image. Which of the following is the most likely diagnosis?

• A)Adenocarcinoma
• B)Chondrosarcoma
• C)Ewing sarcoma
• D)Multiple myeloma
• E)Osteosarcoma

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Definitions:

Cardiovascular System

The cardiovascular system comprises the heart and blood vessels, functioning to circulate blood throughout the body, delivering oxygen and nutrients while removing waste products.

Laplace's Law

A law that describes the relationship between the pressure, volume, and tension in the wall of a spherical or cylindrical object, often applied to blood vessels and the heart.

Blood Vessel

Tubes in the body through which blood circulates, including arteries, veins, and capillaries.

Cross-Sectional Area

The area of a particular section of an object or substance that has been cut across its width, used to determine properties like resistance and strength.