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Pigmented neuroectodermal tumor of infancy. A light microscopic and immunohistochemical study
Z B Argenyi1, R L Schelper, K Balogh
1Department of Pathology, University of Iowa, Iowa City.
Journal of Cutaneous Pathology
|February 1, 1991
Summary
This study analyzed two cases of pigmented neuroectodermal tumor of infancy (PNTI). Findings reveal distinct cell immunophenotypes, aiding in differential diagnosis by excluding melanoma and neuroblastoma.
Area of Science:
- Pediatric Pathology
- Oncology
- Immunohistochemistry
Background:
- Pigmented neuroectodermal tumor of infancy (PNTI) is a rare congenital neoplasm.
- Accurate diagnosis is crucial for appropriate patient management and prognosis.
Purpose of the Study:
- To investigate the immunophenotypic characteristics of PNTI using a comprehensive panel of antibodies.
- To differentiate PNTI from other small round blue cell tumors, particularly melanoma and peripheral neuroblastoma.
Main Methods:
- Analysis of two PNTI cases using routine light microscopy.
- Immunohistochemical staining on formalin-fixed, paraffin-embedded tissues.
- Utilized antibodies against HMB-45, S-100 protein, neuron-specific enolase (NSE), cytokeratin (CK), vimentin, and other markers.
Main Results:
- Large epithelioid cells in PNTI showed strong positivity for CK and HMB-45, with weaker vimentin and NSE expression.
- Small neuroblast-like cells exhibited only focal, weak NSE positivity.
- Both cell types were negative for S-100 protein and other tested antigens.
Conclusions:
- PNTI comprises distinct large and small cell populations with different immunophenotypes.
- CK and HMB-45 expression in pigmented cells, coupled with S-100 negativity, is characteristic of PNTI.
- This immunoprofile assists in excluding melanoma and peripheral neuroblastoma in the differential diagnosis of PNTI.