Seminoma is carcinoma of: September 2005
**Core Concept**
Seminoma is a type of germ cell tumor that originates from the testicular seminiferous tubules. It is a malignant neoplasm characterized by its slow growth and propensity to invade surrounding tissues.
**Why the Correct Answer is Right**
Seminomas are highly sensitive to radiation therapy and chemotherapy, making them relatively treatable compared to other types of testicular cancer. They arise from the seminiferous epithelium of the testis, which is the site of spermatogenesis. The tumor cells often exhibit a characteristic "fried egg" appearance under microscopic examination, with a large nucleus and a small amount of cytoplasm.
**Why Each Wrong Option is Incorrect**
**Option A:** Lymphoma is a malignant tumor of the immune system, not a germ cell tumor.
**Option B:** Teratoma is a type of germ cell tumor, but it is typically benign and composed of multiple tissue types.
**Option C:** Embryonal carcinoma is a type of germ cell tumor, but it is more aggressive than seminoma and often presents with metastasis.
**Clinical Pearl / High-Yield Fact**
Seminomas are typically unilateral and occur in younger men, whereas non-seminomatous germ cell tumors tend to be bilateral and present in older men.
**Correct Answer:** C. Embryonal carcinoma is a type of germ cell tumor, but it is more aggressive than seminoma and often presents with metastasis.