The primary treatment modality for cerebellopontine angle (CPA) tumors is surgery. In the postoperative period, collection of subdural hygroma (SDH) is a rarely encountered complication. This paper presents a 58-year-old male patient who underwent surgery for right acoustic neuroma and developed a SDH postoperatively. Subdural hygroma, even though rarely seen, is a serious complication following CPA tumor surgery, calling for early diagnosis and treatment. Definition, diagnosis, clinical aspects, and treatment of SDH are discussed.