Custom Search

       

 

Dermpath-India

Pathology of Congenital Nevus:

"Brown Birthmark" present at birth.

Dr Sampurna Roy MD       

 

                                                                                                                      

 

Congenital nevi are usually found in newborn infants.

These are usually solitary lesions and are mostly located on the trunk. Some congenital nevi are also found on the lower extremities and scalp.

Most of these nevi are usually less than 10 mm in diameter.

Giant congenital nevi are more than 20 mm in diameter.

Microscopic features:

   

Histopathology reveals that the lesion may be junctional, compound  or intradermal in type.

Nevus cells are present in the lower two-third of the dermis.

These cells extend around the nerves, blood vessels and adnexae.

Involvement of eccrine glands and septa is an important feature of a true  congenital nevus. 

Nevus cells extend between collagen fibres singly or in a Indian file pattern.

 

Melanoma arising in small congenital nevi has a less aggressive growth pattern.

Melanoma arising in giant congenital nevi are usually non epidermal in origin.

The tumour cell patterns include spindle and round cell differentiation, malignant blue nevus and heterologous differentiation. (Example:  Liposarcoma ; Rhabdomyosarcoma etc).

 

Further reading:

A retrospective cohort study of Southeast Asian patients with large congenital melanocytic nevi and the risk of melanoma development.

The risk of malignancy in large congenital nevi

Congenital melanocytic nevi: clinical and histopathologic features, risk of melanoma, and clinical management

Genetic changes in neoplasms arising in congenital melanocytic nevi: differences between nodular proliferations and melanomas

Speckled lentiginous nevus: within the spectrum of congenital melanocytic nevi

Malignant melanoma simulants arising in congenital melanocytic nevi do not show experimental evidence for a malignant phenotype.

Histopathology of congenital pigmented nevi.

The histology of "congenital features" in early acquired melanocytic nevi.

Immunohistologic patterns of congenital nevocellular nevi.

Congenital smooth muscle hamartoma masquerading as congenital pigmented nevus.

Patterns of congenital nevocellular nevi. A histologic study of thirty-eight cases.

 

 

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)


 

 

Histopathology-India.net

 

Pathopedia-India.com

 

Surgical Pathology.com

 

Pathology-India.com

 

Dermpath-India

 

Infectious Disease Online

 

Pathology Quiz Online 

 

Paediatric Pathology Online

 

Pancreatic Pathology Online

 

Paraganglioma-Online

 

Endocrine Pathology Online

 

Eye Pathology Online

 

Ear Pathology Online

 

Cardiac Path Online

 

Pulmonary Pathology Online

 

Lung Tumour Online

 

Mesothelioma-Online

 

Nutritional Pathology Online

 

Environmental Pathology Online

 

Soft Tissue Tumour Online

 

GI Path Online-India

 

Gallbladder Pathology Online

 

E-book - History of Medicine  

 

Microscope - Seeing the Unseen

 

 roypath.in

 

 

Disclaimer

Privacy Policy  

Advertising Policy

Copyright 2017  histopathology-india.net