Huge primary retroperitoneal mature cystic teratoma mimicking adrenal incidentaloma: A case report and literature review

INTRODUCTION: Teratomas originating from extra-gonadal account for 15 % of all teratomas, while retroperitoneal site being the least site for teratoma 1–11 %, extremely rare adrenal teratoma is less than 4 % of the retroperitoneal teratomas. Usually, patients are asymptomatic and the tumours are detected incidentally during imaging. PRESENTATION OF CASE: A case of a 29 years old female, presented with intractable pain for four weeks. Computed tomography scan study of the abdomen showed an avascular septate cystic lesion measuring 11.6 × 11.4 14.5 cm (cranial-caudal x transverse x anterior-posterior) with central fat density and large punctate calcification in the right suprarenal region displacing the inferior vena-cava laterally, abutting the gall bladder, pancreas and duodenum. Impressions of right adrenal teratoma and less likely adrenal myelipoma were suggested. She remarkably improved one day post operation. During clinic visit a month later, she was completely recovered and resumed her daily activities. DISCUSSION: In adults primary retroperitoneal mature cystic teratoma are uncommon, mostly are secondary tumours and very rare will occur in adrenal gland. Adrenal incidentaloma have been seldom reported mimicking primary mature cystic teratoma. Biochemical and Imaging studies are of great importance in diagnosing and showing relationship of the tumour and other organs. This work has been reported in line with the SCARE criteria (Agha et al., 2018 [1]). CONCLUSION: Primary retroperitoneal tumours are rare and surgery is the main stay of treatment whether it be open or laparoscopic, the latter being best for small lesion for it offers early recovery and complete excision gives excellent prognosis of 100 %.