Symptomatic congenital hemangioma and congenital hemangiomatosis associated with a somatic activating mutation in GNA11

IMPORTANCE Congenital hemangiomas are uncommon benign vascular tumors that present fully formed at birth. They are rarely associated with transient hematologic abnormalities, which are typically less severe than the Kasabach-Merritt phenomenon associated with kaposiform hemangioendotheliomas. Congenital hemangiomas are typically solitary and have not been reported to occur in a multifocal, generalized pattern. OBJECTIVE To describe a male infant born with an unusual, large vascular mass complicated by anemia, thrombocytopenia, and disseminated intravascular coagulopathy, as well as innumerable small vascular papules in a generalized cutaneous distribution. DESIGN, SETTING, AND PARTICIPANT This case report is a descriptive observation of the results of clinical, pathologic, and genetic studies performed in a single male infant observed for 2 years (May 2013 to June 2015) for vascular anomalies at a tertiary care referral center. MAIN OUTCOMES AND MEASURES Histopathologic, immunohistochemical, and genetic study results of tumor specimens and saliva. RESULTS Careful pathologic study of 3 tumor specimens revealed similar lobular proliferations of bland endothelial cells. Lesional vessels did not express GLUT1 or the lymphatic marker D2-40, whereasWT1 was expressed. A somatic c.A626C, p.Q209P mutation in the GNA11 gene was identified in tumoral tissue. CONCLUSIONS AND RELEVANCE These findings support a unifying diagnosis of congenital hemangioma for these vascular tumors. To date, this is the first-reported case of a hemangiomatosis presentation of congenital hemangioma. In addition to highlighting this novel phenotype, this case indicates the rare association of congenital hemangioma with hematologic abnormalities and verifies somatic activating mutations as the underlying cause of congenital hemangioma.