Inverted papilloma is a benign sinonasal epithelial tumour that mainly occurs in the fifth to sixth decades of life, with male predominance. The incidence in the young adolescent population is comparatively lower. The clinical and radiological findings may mimic other benign sinonasal tumours, so the diagnosis can only be confirmed by histopathological examination. Consequently, precise diagnostic and therapeutic planning is recommended to achieve the optimal result. We describe a case of unilateral sinonasal tumour in a young adolescent male who showed clinical and radiological features of juvenile nasopharyngeal angiofibroma, such as widening of the sphenopalatine foramen, extension of the mass posteriorly towards the nasopharynx, and presence of flow voids that suggested highly vascular nature of the mass. However, a postoperative histopathological examination showed a diagnosis of inverted papilloma.