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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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