Final answer:
Massive hemoptysis refers to the expelling of more than 600 cc of blood within a 24-hour period and is considered a medical emergency, especially in patients with underlying conditions such as chronic myelogenous leukemia.
Step-by-step explanation:
Massive hemoptysis is defined as more than 600 cc (cubic centimeters)/24 hours. Hemoptysis is the coughing up of blood or blood-stained mucus, which can be a sign of a serious medical condition. In the context of a patient like Benjamin, who is immunocompromised due to chemotherapy for chronic myelogenous leukemia (CML), it could indicate a severe infection or lung complication. The presence of massive hemoptysis, in combination with other symptoms such as a wet cough, dyspnea, a high fever, and hypoxemia indicated by low pulse-oximeter levels, suggests an urgent medical issue that requires immediate attention.