Spindle cell hemangioma

Spindle cell hemangioma (SCH), formerly known as spindle cell hemangioendothelioma, is a rare benign vascular tumor that primarily affects the skin and subcutaneous tissues. It was originally described by Weiss and Enzinger in 1986 and was initially thought to be a low-grade malignancy, but it is now classified as a benign vascular lesion. SCH most commonly presents as a slow-growing, painful or painless nodule typically located in the dermis or subcutaneous tissue of the distal extremities, particularly the hands and feet. The lesions may be solitary or multifocal, and when multifocal, they tend to occur in the same anatomical region. Histologically, spindle cell hemangioma is characterized by a combination of cavernous vascular spaces lined by flattened endothelial cells and solid areas composed of bland spindle-shaped cells, often with intracytoplasmic vacuoles. Phleboliths (calcified thrombi) and organizing thrombi are frequently found within the cavernous spaces. The condition can occur as an isolated finding or in association with other vascular anomalies, including Maffucci syndrome (which combines enchondromas with vascular malformations) and Klippel-Trénaunay syndrome. Some cases have been associated with varicosities and lymphedema of the affected limb. Treatment of spindle cell hemangioma primarily involves surgical excision. Although the tumor is benign and does not metastasize, local recurrence is relatively common, particularly in cases with multifocal disease. Recurrence is thought to represent the development of new lesions rather than true recurrence from incomplete excision. No systemic therapy is typically required. Regular clinical follow-up is recommended to monitor for new lesions, especially in patients with multifocal presentations or associated syndromic conditions.

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