Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 53 7 2015 10 06 448 451 EN Afak Yusuf Sherwani Department of Urology, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India Arif Hussain Sarmast Department of Neurosurgery, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India Ajaz Ahmad Malik Department of General Surgery, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India Mubashir Shah Department of General Surgery, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India Fazl Q-Parray Department of General Surgery, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India Muneer A-Wani Department of General Surgery, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India Sajad Dangroo Department of Urology, Sher I Kashmir Institute of Medical Sciences SGR, Kashmir, India 2015 10 06 2015 10 06 Hydatid disease is a parasitic tapeworm infestation that usually involves liver and lungs. Primary retroperitoneal hydatid without liver and lung involvement is very rare. Surgery is the principle method of treatment for large retroperitoneal hydatid, whenever feasible. We report a case of primary retroperitoneal hydatid cyst in 29-year-old male patient. https://acta.tums.ac.ir/index.php/acta/article/view/4286 https://acta.tums.ac.ir/index.php/acta/article/download/4286/4241