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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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Updated: Mar 16, 2026

Germ Cell Transplantation and Testis Tissue Xenografting in Mice
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[Mediastinal germ cell tumors].

F Bremmer1, P Ströbel2

  • 1Institut für Pathologie, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Deutschland.

Der Pathologe
|August 6, 2016
PubMed
Summary
This summary is machine-generated.

Mediastinal germ cell tumors (GCT) are common, with distinct features in children and adults. Somatic type malignancies in mediastinal GCT often have a poor prognosis.

Keywords:
Age distributionGerm cell and embryonal neoplasmsGonadsLeukemiaMediastinal neoplasms

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Area of Science:

  • Oncology
  • Pathology
  • Genetics

Background:

  • Mediastinal germ cell tumors (mGCT) are the second most common site for GCTs, accounting for 16% of mediastinal neoplasms.
  • While sharing identical morphology and molecular genetics with gonadal GCTs, mGCTs exhibit unique characteristics.

Purpose of the Study:

  • To summarize the unique aspects of mediastinal germ cell tumors (mGCT).
  • To discuss the bimodal age distribution, histological subtypes, and prognosis of mGCT.

Main Methods:

  • Review of existing literature on mediastinal germ cell tumors.
  • Analysis of epidemiological and clinical data for mGCT.

Main Results:

  • mGCTs show a bimodal age distribution: teratomas and yolk sac tumors in pre-pubertal children have a favorable prognosis.
  • In post-pubertal adults, malignant mGCTs predominantly affect males, with a guarded prognosis dependent on histology.
  • Somatic type malignancies are more frequent in mGCTs, and mediastinal yolk sac tumors have a unique association with hematological malignancies, generally leading to a dismal prognosis.

Conclusions:

  • Mediastinal germ cell tumors present unique challenges and prognostic factors compared to gonadal GCTs.
  • The occurrence of somatic type malignancies and associations with hematological disorders significantly impacts patient outcomes.