Facial dermatitis following friction treatment of acne.

A case report is presented herein of a twenty year old woman in whom an acute dermatitis of the face developed, which may have been caused by the use of a skin machine, possibly in combination with the use of a topical medication.     

Evidence for M2 macrophages in granulomas from pulmonary sarcoidosis: A new aspect of macrophage heterogeneity

Background

Sarcoidosis is a granulomatous disease of unknown etiology. Macrophages play a key role in granuloma formation with the T cells, having a significant impact on macrophage polarization (M1 and M2) and the cellular composition of the granuloma. This study evaluates macrophage polarization in granulomas in pulmonary sarcoidosis.

Metaplastic thymoma: report of an unusual thymic epithelial neoplasm arising in the wall of a thymic cyst

In this report, a case of metaplastic thymoma arising in a thymic cyst wall is discussed. The patient was a 61-year-old male whose chief complaint was sweating and chest pain. Imaging study revealed a mediastinal mass with right hemithoracic extension. He underwent surgical resection of the mass and remnants of the thymus. Histologic studies showed a primary thymic neoplasm with a biphasic histologic pattern composed of 2 distinct epithelial and stromal components arising in a thymic cyst wall. Immunohistochemically, the epithelial component was cytokeratin positive and focally reactive for EMA. Marked expression of EMA and vimentin was seen in spindle cells. Metaplastic thymoma is an extremely rare variant of primary thymic epithelial neoplasms with only a few cases reported in the literature.