Indeterminate Subcutaneous Lesion of the Nasal Dorsum in an Adolescent: A Multidisciplinary Approach to a Rare Case of Spindle Cell Lipoma.

We report the case of a 16-year-old girl presenting with a painless, clinically stable subcutaneous swelling of the nasal dorsum with a three-year history. Despite an extensive multidisciplinary diagnostic work-up-including dermatological, otorhinolaryngological, and radiological evaluations (ultrasound, CT, and MRI)-the nature of the lesion remained indeterminate. In order to achieve a definitive diagnosis while preserving the nasal profile aesthetics, the mass was entirely excised via an endoscope-assisted closed rhinoseptoplasty approach. Histopathological analysis revealed a spindle cell lipoma characterized by CD34 positivity and a Ki-67 proliferation index of less than 1%. This finding is extremely rare in terms of both anatomical location and patient age. The present case highlights the crucial role of histopathological examination in establishing the correct diagnosis, supported by a multidisciplinary assessment.