Nasal masses are a clinical entity with great diversity. They present with various symptoms such as nasal obstruction, facial pain, discomfort, epistaxis, headache, anosmia and visual disturbances. Especially unilateral nasal masses are very suspicious and must be differentiated between benign and malignant lesions. Nasal endoscopy is a weapon in the quiver of otorhinolaryngologists. It is an innovative, quick, direct and inexpensive examination that can be performed even at the otorhinolaryngologist's office. Immediate imaging of lesions within the nasal cavity allows rapid initiation of treatment. This article highlights the importance of correct differential diagnosis of a unilateral nasal mass in a 37-year-old female patient.