[Congenital solitary infantile myofibroma: report of two cases]

The infantile myofibromatosis is a rare pathology usually affecting children under 2 years. More than half are congenital, located in head and neck in a 30% of the cases. Myofibroma is a benign mesenchymal tumor that appear an isolated lesion or multiple, with or without visceral involvement. Case 1: A newborn girl that presents lump in scalp suspected of encefalocele. Ultrasound and RM: solid and heterogeneous mass 4 x 2 cm with increased peripheral vascularisation. Case 2: A 7-month-old baby boy with lump in right occipital zone detected at 4 months. Ultrasound and RM: injury 1 x 1.5 cm in head esplenio muscle suggestive of hemangioma.

After surgical total resection, the histological study and immunohistochemical identified the lesion as myofibroma. The evaluation of disease dissemination was normal and the recovery of the patients was favorable. The differential diagnosis of myofibroma must be carried out with other mesenchymal tumors and with non neoplastic injuries characteristics of the region affects. The visceral location and multiple forms worsen the prognosis, so is important do an exhaustive study. Treatment is conservative surgery, but if there is no risk to the child, the possibility of spontaneous regression makes the abstention therapeutic a correct alternative.