صور باثولوجى - Patholgy Slides :. Tumors or Neoplasia : Teratomas and Melanocytic tumors



Patholgy Slides : Tumors or Neoplasia  

Teratomas and  Melanocytic tumors

 

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Teratomas

Benign microcystic teratoma of the ovary

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Teratoma is a tumor which arises from tutipotent germinal cells. Frequently, it is localized in gonads (testis, ovary). It contains a variety of tissues (derived from one, two or three embryonic cell layers - mesoderm, endoderm or ectoderm), tissues which normally are foreign to the site of growth.

Mature teratoma (dermoid cyst) containing well-differentiated structures : respiratory epithelium and nervous tissue - brain. (H&E, ob. x10)

Benign microcystic teratoma of the ovary (II)

Mature teratoma (dermoid cyst) containing well-differentiated structures : respiratory epithelium, hair follicle and smooth muscle. (H&E, ob. x20)

Benign microcystic teratoma of the ovary (III)

Mature teratoma (dermoid cyst) containing well-differentiated structures : stratified epithelium, hair and fat tissue. (H&E, ob. x20)

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Melanocytic tumors

Intradermal melanocytic nevus

Nevus cells (melanocytes) are normally localized in the basal layer of the epidermis. Their proliferation may appear in the epidermis (jonctional nevus), in the epidermis and dermis (compound nevus) or only in the dermis (intradermal nevus).

Intradermal melanocytic nevus - a benign tumor in which the tumor cells form nests in the dermis, are regular, round, with central nucleus and single nucleolus. In the supreficial dermis, some melanocytes may produce melanin pigment in the cytoplasm (dark-brown, granular). (H&E, ob.x4)

Intradermal melanocytic nevus (detail)

Intradermal melanocytic nevus (detail). (Hematoxilina-eozina, ob. x10)