International Journal of Human and Health Sciences Vol. 08 No. 01 January’24 103 https://ijhhsfimaweb.info/index.php/IJHHS Case Report Giant Post-traumatic Splenic Cysts: A Case Report Sagiran Sagiran 1 ,Rizka Fakhriani 2 , Fadli Robby Amsriza 1 Abstract: Splenic cysts are highly infrequent, about 0.07 percent. A post-traumatic splenic cyst is a rare complication that should be noticed if a lump in the left upper abdomen swells after abdominal trauma. This publication reported a case of a 23-year-old male student with a lump in the upper left abdomen. This study aims to describe the patient’s disease with the background of the case above. The author, in this case, uses the case report research method. Case reports are detailed descriptions of rare diseases, recent occurrences, unusual indications or symptoms of disease, unreported studies, or unexpected events observed in a patient during treatment. As a result of the abdominal examination, a smooth mass was palpable on the abdomen, located in the left hypochondrium and epigastric region. This mass is stable, with a diameter of 25 cm. Computed tomography (CT) of the abdomen found hypodense lesions, round, firm, and regular in the spleen, with intralesional pneumatization and air-fluid. A median laparotomy found a giant splenic cyst. A total splenectomy was performed. Found splenic hemorrhagic cysts without signs of malignancy. An unusual occurrence of a post-traumatic giant splenic cyst. A post-traumatic splenic cyst should be considered if one has a mass in the left upper abdomen after experiencing abdominal trauma. Total splenectomy, either open or laparoscopic, is the preferred treatment, especially if the cyst is large. This study is an original study by the author and is data taken directly from patients. Keywords: Abdominal trauma; Post-traumatic splenic cyst; Splenic cyst. Correspondence to: Dr.Sagiran, Department of Surgery, Faculty of Medicine and Health Science, Universitas Muhammadiyah Yogyakarta, Indonesia. Email : sagiran@umy.ac.id. 1. Department of Surgery, Faculty of Medicine and Health Science, Universitas Muhammadiyah Yogyakarta, Indonesia. 2. Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine and Health Science, Universitas Muhammadiyah Yogyakarta, Indonesia. Introduction There were 800 cases reported of splenic cysts, categorized as infrequent lesions, worldwide. Still, splenic cysts correlated with hypersplenism are exceedingly rare since only a few cases are documented globally, and also, in clinical terms, they can be either asymptomatic or symptomatic. In rare cases, patients who have been symptomatic generally experience stomach pain or an abdominal lump. 1 Patients with splenic cysts may suffer left-sided abdomen and shoulder pain, as well as postoperative heaviness, and it has higher chances of infection and rupture if the splenic cysts’ diameter is more than five cm. 2 Primary cysts (including neoplastic and congenital) and secondary cysts are splenic cysts International Journal of Human and Health Sciences Vol. 08 No. 01 January’24 DOI: http://dx.doi.org/10.31344/ijhhs.v8i1.629