This lesion was removed from the abdomen of a 23-year-old pregnant woman. Microvenular hemangiomas are uncommon, but appear more often in pregnant women, as in our case, suggesting a hormonal role in their histogenesis. The histology in this case is typical, with small-vessel proliferation within a sclerotic stroma. The differential diagnosis may include Kaposi sarcoma, but those lesions often show more cytologic atypia and poor vessel formation.
Histologic sections of skin show a vascular proliferation within the dermis. The vessels are small and thin-walled, anastamosing with abundant intervening dermal collagen. The lesion appears infiltrative in this field, but was overall well-demarcated.