In 2017, the World Journal of Clinical Cases (WJCC) has published the 12^nd issue which containing 9 articles contributed by scientists worldwide. Among these comprehensive articles are (1) “Reliability of Sawai’s classification for dental cervical abrasions: A pilot study”, an Original Article by adhuri A Sawai, BDS, MDS, Associate Professor, et al from Department of Periodontology, Faculty of Dentistry, Jamia Millia Islamia University, India; and (2) “Surgical resection of rare internal jugular vein aneurysm in neurofibromatosis type 1”, a Case Report by Khortnal Delvecchio, DO, General Surgery Resident, et al from Department of Surgery, Detroit Medical Center Sinai Grace Hospital, United States, etc. We invite you to peruse all 9 articles in this issue, as they present the latest research progress/findings and provide insightful comments in clinical cases that will guide basic research and clinical practice in these fields.

This journal is an open-access journal which allows free immediate access to all full-text articles. For details, please visit: Volume 5, Issue 12, December 16, 2017.

Figure 1 The cover of the issue. Editorial Board Member of World Journal of Clinical Cases, Andreas G Schreyer, MD, Associate Professor, Department of Radiology, Regensburg University Medical Center, Regensburg 93051, Germany

The WJCC is a leading academic journal devoted to reporting the latest, cutting-edge research progress and findings of basic research and clinical practice in the field of clinical cases.  It was launched on April 16, 2013 and is published monthly (12 issues annually) by BPG, the world's leading professional clinical medical journal publishing company.

We encourage clinical cases specialists worldwide to submit manuscripts to the WJCC describing their original basic or clinical research findings that are of high academic value and which report new diagnostic techniques or summarize their treatment experiences.

We invited the readers to download and read the E-Journal of this issue, at: http://www.wjgnet.com/2307-8960/e-journal.htm.