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Melanoma developing in a nevoid melanocytoma with myxoid changes: a case report
Andrew S Kao1, Kayla St Claire2, Lisa M Bedford2
1Wayne State University School of Medicine MI, USA.
Summary
This study details a rare case of melanoma that developed from a nevoid melanocytoma with myxoid features. Genetic analysis revealed distinct abnormalities in both the melanoma and melanocytoma components.
Area of Science:
- Dermatopathology
- Oncology
- Medical Genetics
Background:
- Nevoid melanoma and myxoid melanoma are uncommon melanoma subtypes.
- The co-occurrence of nevoid and myxoid melanoma is exceptionally rare.
- Melanocytic tumors require precise classification for accurate diagnosis and treatment.
Observation:
- A 78-year-old female presented with a pigmented lesion on her thigh.
- Histopathological examination revealed a biphenotypic proliferation with features of melanoma and a nevoid component.
- The tumor exhibited a myxoid stroma and epithelioid melanocytes with atypical cytologic features.
Findings:
- Fluorescence in situ hybridization (FISH) identified a homozygous deletion of 9p21 in the atypical melanocytic component.
- Single nucleotide polymorphism (SNP) microarray analysis of the nevoid component showed chromosomal abnormalities, including gain of chromosome 8 and loss of chromosomes 9 and 16q.
- These genetic findings supported a diagnosis of melanoma progressing from a nevoid melanocytoma.
Implications:
- This case highlights the importance of comprehensive histopathological and genetic evaluation for diagnosing rare melanocytic neoplasms.
- Understanding the genetic underpinnings of combined nevoid and myxoid melanoma can inform prognostic assessments.
- Further research into these rare variants may elucidate their distinct biological behaviors and therapeutic strategies.
