Aggressive oral granular cell tumor with periorbital involvement: An unusual case.

Granular cell tumor (GCT) of the oral cavity is rare and so is the involvement of the eye, orbit, and ocular adnexa. A 65-year-old male developed a posttraumatic ulceroproliferative mass over his left cheek for the past 1 year. The mass involved the periorbital region with accompanying blood-stained purulent discharge from multiple sinus tracts over this lesion for the past 6 months. Radiographs of the orbit suggested chronic osteomyelitis. The lesion was not responsive to treatment with antibiotics. Enlarged submandibular lymph node demonstrated reactive lymphadenitis on cytological examination. However, computed tomography scan of the paranasal sinus (PNS) revealed possibly a malignant mass extending into the maxillary sinus and left extraconal space. Surprisingly, histopathological examination and immunohistochemistry from a growth involving the left upper retromolar region that extended up to the midline and periorbital region suggested a diagnosis of GCT. This unusual and new presentation of GCT is not well known to the dentists and also to the ophthalmologists. It is imperative to examine anatomically neighboring structures, especially the eye, nasal cavity, PNSs, and oval cavity among other structures in an underlying pathology in either of these sites.