Embryonal rhabdomyosarcoma of the paranasal sinuses: a case report and review of literature.

Embryonal rhabdomyosarcoma (ERMS) is a rare malignancy with a poor outcome. In this article, we describe a case of ERMS in the paranasal sinuses from a 60-year-old male patient. ERMS derived from the paranasal sinuses is extremely rare. The diagnosis of ERMS must be based on histological findings and immunohistochemical findings. In this case, microscopic observation showed tumor cells were arranged in flocked sheets, cord-like and acinar-like by hyperplastic fibrous tissue. And ERMS tissues were immunopositive for myogenin, desmin, MSA, CD56, vimentin, CD99, Syn and Ki-67 (40%+), and immunonegative for CK, EMA, LCA, GFAP, NSE, S-100, HMB-45 and Melan-A. Here, the patient was treated with multimodal therapy including endoscopic surgery, chemotherapy and radiation, but the patient's postoperative recovery is not too smooth.

A case of mucoepidermoid carcinoma located in the left forearm of a middle-aged pregnant woman.

In this article, we described a mucoepidermoid carcinoma (MEC) located in the left forearm of a 39-year-old pregnant woman. Here, the patient had a superficial tip size apophysis nearly 3 years, which begin to sustained growth after pregnant in 2012, and stopped growth after childbirth. MEC is a rare malignant tumor. Previously reports showed it mainly arise from the salivary, bronchial, thyroid, breast, lacrimal gland and conjunctiva. Here, we reported a case of MEC arising from the forearm gland for the first time. Histological finding showed a cystic and solid tumor in fibrous tissue below the squamous epithelium, and some columnar or cuboidal mucous cells covering on the epidermal cells or mixed with epidermal cells included in the tumor tissues. Also, Focal hyperplasia epidermal cells with round or oval nucleus in center were distributed in small pieces but no keratosis. The tumor tissues were immunopositive for CEA, P63, ki-67 (10%), CK7 and CK5/6, and immunonegative for CK20 and GCDFP-15. This case is a low-grade MEC and the patient's postoperative recovery is smooth.

Malignant myoepithelioma of the breast: a case report and review of literature.

In this article, we described a malignant myoepithelioma of the breast (MMB) in a 69-year-old woman. Breast cancer derived from myoepithelial cells is very rare, usually benign. The diagnosis of MMB based on histological and immunohistochemical finding. In this case, the author diagnosed the tumor as MMB, because tumor tissues were immunopositive for 34ßE12, P63, SMA, S-100, CD10, E-Cad and Ki-67, and immunnegative for CK5/6, desmin, ER, PR and C-erbB-2, because tumor tissue showed invasive growth and local hemorrhage or necrosis, suggesting malignant, and also because there was a transition between the tumor cells and hyperplastic myoepithelium of non-tumorous ducts. The patient's postoperative recovery is smooth and regular following of patient is essential.

Ovarian sclerosing stromal tumor in a young woman with ectopic pregnancy: clinical, pathological, and immunohistochemical studies.

In this article, we described an ovarian sclerosing stromal tumor (SST) in a young woman with ectopic pregnancy. It is important to distinguish SST from fibroma, thecoma, and lipoid cell tumors clinically and histologically. Several unique histologic features including pseudolobulation, sclerosis and prominent vascularity are clearly reflected at histopathological findings. The SST cells were immunopositive for CD34, Desmin and SMA, and negative for factor VIII-related antigen, CD31, S-100, ER and PR. The patient's postoperative recovery was smooth and she was discharged after 21 days.