Social media in academics and research: 21st-century tools to turbocharge education, collaboration, and dissemination of research findings.

The near-ubiquitous use of smartphones and the rapid emergence of free, widely used, social media platforms have combined to turbocharge the dissemination of information at a scale and speed that would have been unimaginable just a few years ago. Increasingly, internet-savvy pathologists of all ages from every corner of the world are flipping the paradigm of traditional academia by posting educational content online free of charge, unencumbered by the limitations of traditional print media and educational conferences. These platforms are being used in innovative ways, not just to disseminate research findings, but also to create new knowledge through using them to empower research collaborations. In this review, we outline ways in which social media platforms, such as Twitter, Facebook, and YouTube, are being used by pathologists to enhance academic work and facilitate the dissemination of research. We outline key differences between the various platforms with respect to pathology academics and research, and describe key areas in which these platforms have already made an impact. These include rapid dissemination of research findings to a worldwide audience, live transnational discussion of journal articles and conference proceedings, intercontinental networking between pathologists for academic purposes, free education on a global scale at minimal or no cost, and research collaborations initiated on and facilitated by social media platforms. Finally, we provide practical tips for pathologists who wish to adopt these novel 21st-century technologies to enhance their academic endeavours.

Primary cutaneous perivascular epithelioid cell tumor (PEComa): Five new cases and review of the literature.

PEComas represent a family of uncommon mesenchymal tumors composed of "perivascular epithelioid cells" with a distinct immunophenotype that typically shows both myogenic and melanocytic differentiation. The PEComa family includes angiomyolipoma (AML), clear cell "sugar" tumor of the lung and extra pulmonary sites, lymphangioleiomyomatosis and clear cell myomelanocytic tumor of the falciform ligament/ligamentum teres. Very rarely, PEComas may arise in the skin. Primary cutaneous PEComas typically display a dermal proliferation of epithelioid cells with pale, clear, or granular pink cytoplasm arranged in nests and trabecula with an intervening arborizing network of delicate capillaries. Primary cutaneous PEComas have a lower frequency of myogenic marker expression than their deep soft tissue and visceral counterparts. They also often express strong diffuse CD10, leading to potential confusion with metastatic renal cell carcinoma. Most cases behave indolently. We report 5 additional cases of this rare entity. All showed classic histologic features and expression of either HMB-45 and/or Melan-A/MART-1. Four cases were tested for myogenic markers (2 were positive & 2 were negative). Three cases were tested for CD10 (all 3 were positive). All of our cases with clinical follow-up behaved indolently. Table 1 provides a summary of findings for all 5 cases in our series.

Displaced Cartilage Within Lymph Node Parenchyma Is a Novel Biopsy Site Change in Resected Mediastinal Lymph Nodes Following EBUS-TBNA.

Biopsy site changes in mediastinal lymph nodes (LNs) attributable to prior endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) have not been studied in a systematic manner. Twenty-four contributors from 14 institutions in 5 countries collaborated via social media (Twitter) to retrospectively review consecutive cases of resected mediastinal LNs from patients with prior EBUS-TBNA. Resected LNs were reexamined by submitting pathologists for changes attributable to EBUS-TBNA. Patients who received neoadjuvant therapy were excluded. Cases with suspected biopsy site changes underwent central review by 5 pathologists. A total of 297 mediastinal LN resection specimens from 297 patients (183 male/114 female, mean age: 65 y, range: 23 to 87) were reviewed. Biopsy site changes were most common in station 7 (10 cases) followed by 11R, 4R, and 10R, and were found in 34/297 (11.4%) cases, including displacement of tiny cartilage fragments into LN parenchyma in 26, intranodal or perinodal scars in 7, and hemosiderin in 1. Cartilage fragments ranged from 0.26 to 1.03 mm in length and 0.18 to 0.62 mm in width. The mean interval between EBUS-TBNA and LN resection was 38 days (range: 10 to 112) in cases with biopsy site changes. A control group of 40 cases without prior EBUS-TBNA, including 193 mediastinal LN stations, showed no evidence of biopsy site changes. Biopsy site changes are identified in a subset of resected mediastinal LNs previously sampled by EBUS-TBNA. The location of the abnormalities, temporal association with prior EBUS-TBNA, and the absence of such findings in cases without prior EBUS-TBNA support the contention that they are caused by EBUS-TBNA.