The occurrence of malignant tumors, such as adenocarcinoma, is commonplace in the nasal region, characterized by a notably low incidence. This rarity often contributes to delayed diagnosis, rendering the condition challenging to manage. Here, we present the case of a 70-year-old man who presented with chronic left nasal obstruction, accompanied by headaches and recurrent epistaxis. The diagnostic investigation revealed an extensive and aggressive nasal adenocarcinoma, necessitating a hemi-maxillectomy for tumor excision. Subsequent reconstruction of the ipsilateral cheek was accomplished using a pectoralis major flap. Despite the initial intervention, the patient experienced a recurrence 1 year later. In sinonasal adenocarcinoma, nasal obstruction stands out as the predominant symptom, complemented by potential manifestations of swelling and facial deformation. The inherently aggressive nature of this tumor underscores the imperative for early diagnosis and meticulous management to achieve optimal therapeutic outcomes. The comprehensive approach involving surgical intervention and reconstruction reflects the complexity in treating advanced nasal adenocarcinomas.