Metastatic Histiocytic Sarcoma with Secondary Involvement of the Skin: A Case Report.

Histiocytic sarcoma (HS) is a rare malignant neoplasm of presumed hematopoietic origin, showing morphologic and immunophenotypic evidence of histiocytic differentiation. A 61-year-old woman presented with an abdominal mass. She had a history of HS in both adrenal glands.

Exposure to air pollution and incidence of atopic dermatitis in the general population: A national population-based retrospective cohort study.

Background: To date, little evidence is available to determine whether atopic dermatitis (AD) can be caused by exposure to air pollutants, including gases and particulate matter.

Objective: We aimed to evaluate the relationship between air pollutants and incidence of AD using the National Health Insurance Service-National Sample Cohort database.

Methods: We included 209,168 subjects from the general population previously not diagnosed with AD between 2008 and 2013.

Primary Cutaneous Solitary Fibrous Tumor on the Back.

Solitary fibrous tumors (SFT) are uncommon mesenchymal tumors. SFT have several synonyms including localized fibrous tumor, benign mesothelioma, localized fibrous mesothelioma, and submesothelial fibroma. SFT usually occur in the pleura or other serosal surfaces, but SFT can also develop in extrapleural areas including the nasal cavity, orbit, retroperitoneum, and pelvis.