English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

True histiocytic sarcoma (THS) is a rare form of malignant neoplasm, which is thought to have a poor prognosis. We report the case of a 47-year-old woman who presented with a solitary cutaneous tumor on the forehead. After excision of the tumor, she had no recurrence or metastasis for 10 years. Microscopic observation showed massive infiltration of histiocytoid tumor cells from the dermis without epidermotropism to the deep muscle layer. The large histiocytoid tumor cells contained folded nuclei with frequent mitoses and abundant cytoplasm, but showed no phagocytosis. Muscle fibers were destroyed by infiltration of the tumor cells. Immunohistochemically, the tumor cells were positive for histiocytic markers (CD68 and lysozyme), but negative for lymphoid and epithelial markers. No rearrangement of the immunoglobulin heavy chain and T-cell receptor β/γ chain genes was demonstrated. Therefore, the lesion was diagnosed as primary cutaneous true histiocytic sarcoma (PCTHS) based on the current, strict definition of histiocytic malignancies. In reviewing the literature, we found that some PCTHSs had an indolent clinical course; therefore, we propose that PCTHSs may have variable prognoses.

Primary Cutaneous True Histiocytic Sarcoma: A Case with an Indolent Course