Primary vulvar extragastrointestinal stromal tumor in a 77‐year‐old woman

Author:

Mohamed Nada1ORCID,Khan Mohammad2,Hosler Gregory23ORCID,Tumminello Katherine2

Affiliation:

1. Department of Pathology Texas A&M College of Medicine‐Baylor Scott & White Health Temple Texas USA

2. ProPath Dallas Texas USA

3. Department of Dermatology University of Texas Southwestern Dallas Texas USA

Abstract

AbstractExtragastrointestinal stromal tumors (EGISTs) carry the same morphological, immunohistochemical and molecular features as gastrointestinal stromal tumors (GISTs) and involve extragastrointestinal tract soft tissue. The majority of reported EGIST cases arise from intraabdominal, retroperitoneal, or pelvic soft tissue. A significant subset of such tumors originates from the gastrointestinal muscle layer, grows in an exophytic manner, then loses attachment to the gastrointestinal tract. Consequently, true EGISTs are exceedingly rare. Herein, we are reporting a case of a vulvar EGIST. A 77‐year‐old woman presented with a painless subcutaneous nodule on the right perineum. An excisional biopsy showed a fairly circumscribed bland spindle cell lesion in the dermis. The tumor cells were positive for CD117 and ANO1/DOG‐1 and negative for smooth muscle myosin, smooth muscle actin, STAT6, low‐ and high‐molecular‐weight cytokeratins, SOX10, MART‐1, CD10, S‐100 protein, and estrogen and progesterone receptors. A diagnosis of EGIST was made and complete excision was recommended. Superficial/subcutaneous EGISTs are extremely rare, and it is important for dermatopathologists to be aware of this entity as it can be misdiagnosed as more common spindle cell neoplasms, both benign and malignant, including but not limited to smooth muscle neoplasms (leiomyoma/leiomyosarcoma), spindle cell melanoma, and sarcomatoid squamous cell carcinoma.

Publisher

Wiley

Subject

Dermatology,Histology,Pathology and Forensic Medicine

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