Infantile myofibromatosis: Solitary type

MRI scan demonstrates the mass originating from the deep lobe of left parotid gland (A: axial plane; B: coronal plane).

The mass was dissected from the facial nerve with blunt and sharp dissection.

Histopathological examination revealed spindle-shaped cells with eosinophilic cytoplasm in a loose fibrous stroma containing collagen fibers (H&E stain).;

Tumor cells invading vessels in some parts of the lesion.

Immunohistochemical examination: cells stained for smooth muscle actin.