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High-grade trichoblastic carcinosarcoma.

Dmitry V Kazakov¹, George Vittay, Michal Michal

¹Sikl's Department of Pathology, Charles University, Medical Faculty Hospital, Pilsen, Czech Republic. kazakov@medima.cz

The American Journal of Dermatopathology

|January 24, 2008

Summary

This summary is machine-generated.

This report details a high-grade trichoblastic carcinosarcoma, a rare skin neoplasm. The second documented case, it highlights distinct epithelial and stromal components with aggressive features, differentiating it from basal cell carcinoma.

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Area of Science:

Dermatopathology
Oncology
Surgical Pathology

Background:

Trichoblastic carcinosarcoma is a rare cutaneous neoplasm.
The first case was reported in 2004 as a low-grade variant.

Observation:

A high-grade variant of trichoblastic carcinosarcoma is presented in a 92-year-old male with an ulcerated ear lesion.
Microscopically, the tumor exhibited distinct epithelial and atypical stromal components with follicular differentiation.
Immunohistochemistry confirmed separate epithelial (cytokeratin-positive) and stromal (vimentin-positive) cell populations.

Findings:

The neoplasm demonstrated a fenestrated growth pattern with basaloid epithelial nests and atypical stromal cells.
Features included nuclear atypia, frequent mitotic figures, and pleomorphic spindle and multinucleated cells.
The tumor was classified as a high-grade carcinosarcoma, distinct from metaplastic basal cell carcinoma.

Implications:

This case expands the understanding of trichoblastic carcinosarcoma, particularly its high-grade potential.
Distinguishing this entity from sarcomatoid basal cell carcinoma is crucial for accurate diagnosis and treatment.
Further research into the histogenesis and behavior of these rare tumors is warranted.