Final answer:
A rare complication of a mucinous cystadenocarcinoma or appendicular carcinoma is the development of cysts that can cause GI distress and weight loss. There is a severe risk if these cysts burst, leading to anaphylaxis or death. Monitoring for cancer recurrence, such as elevated AFP suggesting relapse, is also important.
Step-by-step explanation:
A rare complication of mucinous cystadenocarcinoma, an ovarian tumor, or appendicular carcinoma is the development of cysts in organs such as the lungs and liver. These cysts can cause symptoms including nausea, gastrointestinal discomfort, and weight loss. A particularly serious risk associated with these cysts is the potential for them to burst, which can lead to severe anaphylaxis or even death.
It is important for cancer survivors to be monitored after their treatment because of the risk of relapse. For example, elevated levels of alpha-fetoprotein (AFP) in a child who was previously treated for a teratoma could indicate a relapse with an endodermal sinus tumor.