Locally Aggressive Rib Hemangioma With Glomeruloid and Papillary Features - Expanding the Clinicopathologic spectrum of Bone Hemangiomas.

Intra-osseous hemangiomas are uncommon tumors that can present diagnostic and treatment dilemmas. Bone hemangiomas with papillary and glomeruloid growth patterns are exceptionally rare. We present an example of an intra-osseous hemangioma of the rib displaying aggressive features on both radiology and histology. Morphologically, prominent papillary and glomeruloid architectural patterns were observed, in addition to features of cavernous and capillary hemangiomas. Extensive extra-osseous soft tissue involvement was seen. Awareness of the diverse histological features and locally aggressive behavior of bone hemangiomas is important in avoiding over-interpretation as a malignant lesion.