Background: Infantile myofibromatiosis (IM) is a rare benign tumor in the infants, but it has a bad prognosis if IM erncroaches on the viscera. Multiple tissues can be invaded by IM, including the subcutaneous tissue, the muscle of the neck, back, and head, but seldom in the bones and the viscera. The histopathologic and immunohistochemical examinations are necessary in daigonosis of IM as it might be misdiagnosed as the malignant tumor. Materials and Method: Thirty-two consecutive patients with IM in our hospital (2003-2013) were enrolled and the clinical date were analyzed to understand IM better, such as the feature of clinical manifestations, pathology, imaging tests, and treatment. Results: All of them underwent excision operations, 4 of them with invasion in the bones, 2 with invasion in the craniums, and the rest in the ulna and the humerus. The immunohistiochemical analysis shown that the tumor cells were positive to vimentin and smooth muscle actin while negative to the S100 protein and desmin. Twenty-five patients were in follow-up, 2 cases recurred. Conclusions: IM is a benign tumor, but IM with the viscera involvement has a bad prognosis. The strategy of waiting and observation for IM without visceral involvement could be selected.

Oncocytic carcinoma (OC) arising in the salivary gland is a very rare tumor with only 32 previously reported cases. In this report, we describe a novel case of oncocytic carcinoma with associated thymoma, which arose in the left parotid gland of a 66-year-old male with a history of a painless left parotid mass for 1 year. Oncocytes are large, polygonal cells that are characterized by marked cellular atypia, frequent mitoses, wide eosinophilic granular cytoplasm, a central nucleus and a prominent nucleolus. The follow-up data showed no evidence of recurrence and the patient is in a good health 20 months after the surgery. In the current case, the patient had not only OC but also thymoma, which is exceedingly rare and may represent the first documented case in the literature.