Sinusoidal Hemangioma

**Semantic type:** Neoplastic Process

**Definition:** A rare variant of cavernous hemangioma that manifests as a solitary, painless, bluish nodule in the reticular dermis or subcutaneous tissue. Morphologically, it is characterized by the presence of irregular, dilated, interconnecting thin-walled vascular channels in a sinusoidal or sieve-like pattern.