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Aneurysmal bone cysts (ABCs) are vascular, cystic, benign osseous tumors that can expand rapidly and cause local destruction of surrounding tissues. These tumors are typically found in tubular bones and spines. An aneurysmal bone cyst is an extremely rare bony lesion in the head-and-neck region. We present the case of a 7-year-old girl with a left side nasal block and proptosis of the left eye for 3 months. On examination with anterior rhinoscopy, it showed a mass with a smooth surface inside the left nasal cavity. Biopsy confirmed the diagnosis of ABC, and she underwent complete endoscopic excision of the sinonasal mass. A giant ABC in the sinonasal area is highly uncommon, particularly in the pediatric age group. It is often confusing in its differential diagnosis with other malignant and vascular lesions of the head-and-neck region or sinonasal tract. Surgical removal is the treatment of choice.