Rapid Enlargement of Vulvar Glomus Tumor After Needle Aspiration and Tumor Base Ligation.

Vulvar glomus tumors are rare and typically benign, slow-growing tumors. Rapid enlargement is uncommon and may suggest malignancy or other atypical conditions. A 58-year-old postmenopausal woman noticed a small vulvar nodule. After needle aspiration at another hospital, significant bleeding occurred, requiring tumor base ligation. Although hemostasis was achieved, the mass subsequently continued to enlarge rapidly, prompting referral to our hospital. The lesion continued to enlarge gradually, so surgical excision was therefore performed. Histopathological findings confirmed a glomus tumor with atypical features, including a marked edematous stroma. The rapid enlargement was not attributed to malignancy, a hematoma, or an infection, but was considered to represent apparent growth associated with increased edema secondary to vascular congestion within the tumor. The present case highlights that the rapid enlargement of glomus tumor-related lesions does not necessarily indicate malignancy.