Adrenal cystic lesions are uncommon, non-functional, and asymptomatic. Adrenal Pseudocyst is a fibrous cyst devoid of any epithelial or endothelial lining. They have a female predominance with an incidence ratio of 3:1, usually occurring in the 3rd and 4th decade of life. We describe a case of a massive left-sided adrenal pseudocyst in a 50-year-old obese lady who had been experiencing stomach pain and distension for six months before her presentation. Investigations revealed a considerable cyst arising from the left adrenal gland. Excision via midline laparotomy incision was planned. Findings are discussed, including radiology, cytology, histology, and patient management. Adrenal Pseudocyst is a rare lesion, and imaging may mislead in diagnosis. Consider alternative diagnoses including benign and malignant masses of nearby organs, particularly the adrenal, kidney, and pancreas. After surgical excision, a pathological study is necessary for a conclusive diagnosis.