Solitary Fibrous Tumour of the External Auditory Canal: A Rare Entity

Abstract

A solitary fibrous tumour (SFT) is a rare benign spindle-cell neoplasm of mesenchymal origin that commonly arises in the pleura but can occur in other locations such as head and neck, in particular in the orbit, oral cavity and paranasal sinuses.
In the literature, there are only three reported cases of SFT in the external auditory canal. We present the fourth case and review the literature. A 27-year-old female presented with a neoplasm on the posterior wall of the external auditory canal with mild conductive hearing loss and ear discharge episodes. Imaging studies revealed regular margins and no invasion of the surrounding tissues. A complete surgical excision was made. Histologically, the mass comprised spindle cells with areas of hypo and hypercellularity, and immunohistochemically, there was a positive reaction for CD34, vimentin, CD99, BCL2 and STAT-6. After 6 months of follow-up, there were no signs of recurrence.