The given clinical scenario involves a patient with nasal congestion, discharge, intermittent nasal bleeding, and spontaneous exfoliation of an upper molar tooth. Let's analyze the options to arrive at the most likely diagnosis.
Based on the symptoms provided, including the unusual and suggestive symptom of spontaneous tooth loss, the most likely diagnosis is Maxillary sinus malignancy. This option accounts for the aggressive and destructive nature of the condition affecting local structures, which fits the presentation of the patient.