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[Histopathological and ultrastructural studies of melanomatic neuroectodermal tumor of infancy]
1Department of Oral Pathology, School of Stomatology,Shanghai Second Medical University.Shanghai 200011, China.
Abstract:
Three cases of melanomatic neuroectodermal tumor of infancy(MNTI) were studied.The tumor mainly consisted of small neuroblastic-like cells and pigmented large cuboidal cell,and infiltrated adjacent tissues.The main ultrastructural charactristics were the presence of some membranebound dense-core secretory granules,numerous free ribosomes and polysomes aggregaed in rosettes,occasional mitoses in the small cells;and four types of membranebound pigment granules corresponding to melanosomes at different stages of maturation in the pigment cell.immunohistochemical results indicated that both of main cells were positive reaction for NSE,negative for S-100.These facts suggested they are immature in and malignancy.Further,the isogenesis of the tumor cells and embryo optic cup cells were discussed.
Insights
This study examined three cases of melanomatic neuroectodermal tumor of infancy (MNTI), revealing immature and malignant cellular characteristics. Findings suggest a potential link between MNTI cells and embryonic optic cup cells.
Area of Science:
- Oncology
- Developmental Biology
- Cell Biology
Background:
- Melanomatic neuroectodermal tumor of infancy (MNTI) is a rare congenital neoplasm.
- Understanding the cellular origin and characteristics of MNTI is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the ultrastructural and immunohistochemical features of MNTI.
- To explore the potential isogenesis of MNTI cells with embryonic optic cup cells.
Main Methods:
- Histopathological and ultrastructural examination of three MNTI cases.
- Immunohistochemical analysis using Neuron-Specific Enolase (NSE) and S-100 markers.
Main Results:
- MNTI tumors comprised small neuroblastic-like cells and pigmented large cuboidal cells, infiltrating adjacent tissues.
- Ultrastructural analysis revealed secretory granules, ribosomes, and melanosomes in pigment cells.
- Immunohistochemistry showed NSE positivity and S-100 negativity in both cell types, indicating immaturity and malignancy.
Conclusions:
- The cellular profile of MNTI suggests immature and malignant characteristics.
- The study discusses the potential isogenesis of MNTI cells with embryonic optic cup cells.
