Embryonal carcinoma

Content sourced from Wikipedia, licensed under CC BY-SA 3.0.

Embryonal carcinoma

Embryonal carcinoma is a rare type of germ cell tumor. It is considered nonseminomatous and can arise in the ovaries or the testes. Most often it appears as part of a mixed germ cell tumor in the testis, but it can also occur as a pure tumor, especially in the testis or, much more rarely, in the ovary.

Signs and symptoms
- In the testis, you may notice a lump or enlargement of the testicle. Some people have signs of metastasis without a visible lump, such as back pain, trouble breathing, cough, coughing up blood, vomiting blood, or neurological problems.
- In the ovary, embryonal carcinoma is rare and usually occurs in teenagers (median age about 15). It may cause early puberty signs or abnormal uterine bleeding. Hormone markers in the blood (like hCG or AFP) may be elevated if another tumor type is present.

Diagnosis and blood tests
- Pure embryonal carcinoma often does not raise AFP in the blood. If AFP is high, a yolk sac tumor might be involved.
- The tumor’s appearance in the body is usually a pale, gray mass with areas of bleeding or dead tissue.
- Under the microscope, the cancer cells have indistinct borders, many dividing cells (mitoses), and a mix of growth patterns (solid, gland-like, papillary, or embryoid bodies). The cancer cells may look like they are trying to form primitive tubules, which reflects their development toward more mature germ cells.

What the tumor looks like in the testes and ovaries
- Testicular embryonal carcinoma most often appears as part of a mixed germ cell tumor (about 84% of cases); about 16% are pure embryonal carcinoma.
- The main patterns in the testis are solid (around 55%), glandular (17%), and papillary (11%). Other patterns are less common.
- In the ovary, embryonal carcinoma accounts for about 3% of ovarian germ cell tumors. Tumors are usually large and tend to spread beyond the ovary in about 40% of cases. Surgery and chemotherapy have improved outcomes.

How it’s different from similar tumors
- Embryonal carcinoma is distinguished from seminoma, teratocarcinoma, yolk sac tumor, and Sertoli–Leydig cell tumor by how the cells look and develop. The cancer cells often show attempts to form early, primitive structures, unlike some other germ cell tumors.

Treatment and prognosis
- Treatment typically involves surgery and chemotherapy. Because embryonal carcinoma can spread, timely diagnosis and treatment are important. The outlook has improved with modern chemotherapy, especially for tumors that have already spread.

Summary
Embryonal carcinoma is a rare germ cell cancer that can occur in the ovaries or testes. It may be part of mixed tumors or, less often, a pure cancer. It often presents as a lump in the testis or signs of metastasis, and it is usually diagnosed by its characteristic microscopic patterns. AFP levels help in differentiating it from yolk sac tumors, and treatment with surgery and chemotherapy has improved outcomes.