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Pediatric_Oncology_A_Comprehensive_Guide.pdf
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16 Germ Cell Tumors

179

 

 

•Symptoms: scrotal enlargement, commonly associated with hydrocele

•Imaging: ultrasound, CT and/or MRI

– Detection of metastases: bone scintigraphy, CT of lungs

The most frequent forms of germ cell tumors in males include the following.

16.8.1Testicular Yolk Sac Tumor

Synonyms: yolk sac tumor, endodermal sinus tumor

•Frequency 26%

•Mean age 2 years

•AFP level usually high

16.8.1.1 Macroscopic Features

• Solid, homogeneous, fragile tumor with cystic and necrotic areas

16.8.1.2 Microscopic Features

•Network of stromal tissue

•Papillary structures with central vessels

•Intraand extracellular eosinophilic compartments that are periodic acid-Schiff (PAS)-positive, AFP-positive, and a-antitryspin-positive

Staging

Stage I: Tumor limited to testes, no evidence of disease beyond the testes

Stage II: Involvement of retroperitoneal lymph nodes

Stage III: Additional solitary or multiple metastases

16.8.1.3 Therapy

•Complete excision critical to reduce risk of subsequent malignant degeneration and recurrence; chemotherapy for stages II and III or following relapse; longterm survival rate of 80%

16.8.2Testicular Teratoma

•Frequency of 24%

•Mean age 3 years

16.8.2.1 Histopathology

Teratomas originate from pluripotent germ cells that can give rise to tissues of all three embryonic germ layers:

•Ectodermal: epithelial and neuronal tissue

•Mesodermal: muscles, teeth, bone, and cartilage

•Endodermal: mucinous parts of gastrointestinal and/or respiratory tissue

•Histology can be embryonal, fetal, or adult

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