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Congenital Spitz Melanocytoma With Activating ZKSCAN1::MET Kinase Fusion
Tzah Feldman1, Hiba Zaaroura2, Hanaa Haj Abaya2
1Department of Pathology, Rambam Health Care Campus, Haifa, Israel.
Journal of Cutaneous Pathology
|July 15, 2025
Summary
Congenital Spitz tumors are rare, often diagnosed via histology. Molecular analysis revealed a ZKSCAN1::MET fusion in a congenital Spitz tumor, highlighting the importance of genetic testing for accurate diagnosis.
Area of Science:
- Dermatology
- Oncology
- Molecular Pathology
Background:
- Congenital Spitz nevi are infrequently documented, with diagnoses relying on histopathology and immunohistochemistry.
- Spitz tumors represent a spectrum of melanocytic neoplasms with variable malignant potential.
Observation:
- This report details a rare case of a congenital Spitz tumor.
- The tumor was analyzed using comprehensive molecular studies.
Findings:
- Molecular analysis identified a specific ZKSCAN1::MET gene fusion.
- No other significant somatic mutations or copy number variations were detected.
- Activating MET kinase rearrangements are uncommon in Spitz tumors and melanomas.
Implications:
- The ZKSCAN1::MET fusion supports a diagnosis of congenital Spitz melanocytoma.
- This case emphasizes the critical role of molecular diagnostics in characterizing Spitz tumors.
- Understanding genetic alterations aids in precise diagnosis and potentially informs prognosis.
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