Journal of Krishna Institute of Medical Sciences University 94 Ó Ó CASE REPORT Drainage of External Jugular Vein into an Unusually Wider Internal Jugular Vein - A Rare Case Report 1 1 1* Ashwija Shetty , Suhani Sumalatha , Sushma Prabhath 1 Department of Anatomy, Kasturba Medical College Manipal, Manipal Academy of Higher Education, Manipal-576104 (Karnataka) India ISSN 2231-4261 JKIMSU, Vol. 9, No. 3, July-September 2020 Abstract: The superficial veins are of utmost importance clinically for cannulation, which is required for diagnostic purposes and intravenous therapy. One such superficial vein in the neck region is the external jugular vein. The other vein, deeper in this region, is the internal jugular vein. The internal jugular vein is commonly used for central venous catheterization. Anomaly in the course and termination of both external and Internal Jugular Veins (IJV) are critical as they serve as an important route/site to perform various diagnostic or therapeutic procedures. Present case shows a rare variation of termination of the right external jugular vein into an unusually wider IJV. Variation as described in the present case, if found, would ease the clinicians' task to approach a less accessible IJV. Ultrasound-guided venous catheterization would serve as a guide to perform the procedure with ease and also to be familiar with such variations existing in the venous channels Keywords: External Jugular Vein, Internal Jugular Vein, Variation, Catheterization Introduction: Superficial veins of the head and neck mainly drain into the External Jugular Vein (EJV). The EJV is formed by the union of the posterior division of Retromandibular Vein (RMV) and Posterior Auricular Vein (PAV) and drains into the Subclavian Vein (SV). The deeper vein at this site, Internal Jugular Vein (IJV) collects blood from the brain, neck and superficial part of the face and is formed at the base of the skull by the union of the sigmoid sinus and inferior petrosal sinus, runs vertically downwards to unite with the SV and form the brachiocephalic vein. Jugular veins are among the accessible veins for various clinical and diagnostic approaches. IJV is one of the routes for Central Venous Cannulation (CVC), which is feasible and accessible in almost all age groups. EJV also serves as an alternate route for CVC especially in children in shock, dehydration and also cardiac patients with higher rates of success [1-2]. EJV is an easily accessible superficial vein in the neck. It is therefore used for cannulation either for intravenous therapy or diagnostic purpose apart from providing a reliable estimate of central venous pressure. EJV is also considered to be the preferred site for CVC when IJV is not functional [3]. Thorough knowledge of the formation, course, patency and termination of jugular veins is therefore of much use due to its need in various clinical procedures. Case Report: During the routine dissection for students, an unusual draining pattern of the veins in the head and neck region of a 54-year-old male cadaver was seen on the right side (Fig. 1). On further observation and dissection, it was noted that the