A.S. Harugop, Priti Hajare, R.S. Mudhol, Dharmishtha R. Kaku, Bijjal Raj, Vishnu V. Pillai, et al.,. Solitary Sinonasal Fibrous Tumour: A Rare Presentation And Pathology. Int J Clin Exp Otolaryngol. 2020;6(2):114-116. 114 OPEN ACCESS https://scidoc.org/IJCEO.php International Journal of Clinical & Experimental Otolaryngology (IJCEO) ISSN 2572-732X *Corresponding Author: Dr. Dharmishtha R. Kaku, MBBS, Resident, Department of ENT and Head and Neck Surgery, Jawaharlal Nehru Medical College , Nehru Nagar, Belagavi-590010, Karnataka, India. Tel: +919164403312 E-mail: dharmi_11@yahoo.co.in Received: June 21, 2020 Accepted: August 01, 2020 Published: August 05, 2020 Citation: A.S. Harugop, Priti Hajare, R.S. Mudhol, Dharmishtha R. Kaku, Bijjal Raj, Vishnu V. Pillai, et al.,. Solitary Sinonasal Fibrous Tumour: A Rare Presentation And Pathology. Int J Clin Exp Otolaryngol. 2020;6(2):114-116. doi: http://dx.doi.org/10.19070/2572-732X-2000021 Copyright: Dharmishtha R. Kaku © 2020. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited. Solitary Sinonasal Fibrous Tumour: A Rare Presentation And Pathology Research Report A.S. Harugop 1 , Priti Hajare 2 , R.S. Mudhol 3 , Dharmishtha R. Kaku 4* , Bijjal Raj 4 , Vishnu V. Pillai 4 , Deepika Reddy Ramidi 4 1 Professor and Head of Department, Department of ENT and Head and Neck Surgery, Jawaharlal Nehru Medical College , Nehru Nagar, Belagavi, Karnataka, India. 2 Professor, Department of ENT and Head and Neck Surgery, Jawaharlal Nehru Medical College , Nehru Nagar, Belagavi, Karnataka, India. 3 Vice Principal and Medical Superintendent, Professor, Department of ENT and Head and Neck Surgery, Jawaharlal Nehru Medical College, Nehru Nagar, Belagavi, Karnataka, India. 4 Resident, Department of ENT and Head and Neck Surgery, Jawaharlal Nehru Medical College , Nehru Nagar, Belagavi, Karnataka, India. Introduction Solitary fbrous tumor also known as benign fbrous mesothe- lioma or submesothelial fbroma, is sub-classifed under existing mesothelial tumors [1]. Sinonasal hemangiopericytomas are vari- ant of solitary fbrous tumors. They are rare vascular neoplasms of the outer wall pericytes of Zimmermann cells that lie external to the reticulin sheath of capillaries and constitute around 1% of all angiogenic tumors [2]. Here we report a 21 year old male with sinonasal hemangiopericytoma. We performed a wide local excision without the requirement of pre-operative embolization. To our knowledge this is the frst of its kind presentation of the neoplasm requiring external approach for excision. Report A 21 year old male patient came to us with complaints of a swell- ing over medial canthus of the left eye extending upto the left bony dorsum and bridge of the nose since one and a half years. On examination it was 2x3 cm frm, non fuctuant, non transillu- minant and pinkish brown swelling with a discharging sinus over its surface (Figure 1). The discharge was serosanguinous and non- foul smelling. He also gives complaints of blurring of vision in the left eye with normal eyeball movement, probably due to mass leison. Other complaints of nasal obstruction, epistaxis, fever and weight loss were absent. A CT scan was done to know the extent of the swelling and it revealed breach into the left anterior ethmoidal sinus while the left medial orbital wall was intact. Also anterior and posterior ethmoi- dal arteries were seen as feeding vessels to the tumor (Figure 2). The patient was taken up for surgery and a wide local excision of the lesion was done. A curvilinear incision was taken below the swelling and was dissected from all the sides maintaining hemo- stasis (Figure 3). The mass was excised completely and the skin was sutured in layers. The mass was sent for histopathological examination. It showed neoplastic cells tightly packed with hy- perchromatic nuclei which were situated around endothelial lined vascular spaces. There was presence of perivascular hyaliniza- Abstract Solitary Fibrous tumour represents a spectrum of mesenchymal tumors, encompassing tumors previously termed as heman- giopericytomas. They are vascular neoplasms of outer wall pericytes of Zimmermann’s capillaries. These tumors presumed to be of fbroblastic differentiation, seen most commonly in adults and can occur at any site. We report the case of a young adult male presenting with a swelling over medial canthus of left eye with a discharging sinus. Wide local excision was done and the diagnosis was confrmed by biopsy and immunohistochemistry. Keywords: Solitary Fibrous Tumor; Haemangiopericytoma; Immunohistochemistry; CD34; Mic-2;bcl-2.