Localized Tendon Sheath Giant Cell Tumor of Temporomandibular Joint Presenting as a Parotid Gland Tumour: a Rare Case and Review of the Literature

Localized tendon sheath giant cell tumour (TSGCT-L), also known as Tenosynovial giant cell tumour (TGCT) is a rare benign tumour occurring in the hand, knee, ankle, shoulder, fingers and rarely affect the temporomandibular joint. Clinically TSGCT-L may occur at any age, but usually diagnosed in patients between 30 years and 50 years of age and is more common in women. We conducted a literature review for 8 cases reports related to TSGCT-L of temporomandibular joint (TMJ) and described one additional case report treated in our hospital. LSGCT-L of the temporomandibular joint is a rare entity, the treatment of choice was surgery excision, but careful preoperative planning with Computed tomography (CT scan) and Magnetic resonance image (MRI) were recommended to obtain a successful outcome with as little morbidity as possible. Tenosynovial giant cell tumour of temporomandibular joint may be presented clinically and radiologically as a primary parotid gland lesion, with the cytology diagnosis using fine needle aspiration biopsy the suspicion of the parotid gland tumour was excluded due to a undiagnostic result of a tumour.