Imaging of the Temporomandibular Joint by Ingrid Rozylo-Kalinowska & Kaan Orhan

Author:Ingrid Rozylo-Kalinowska & Kaan Orhan
Language: eng
Format: epub
ISBN: 9783319994680
Publisher: Springer International Publishing

11.1.8 Adenoid Cystic Carcinoma

Adenoid cystic carcinoma (ACC) is a malignant tumor of secretory glands and most commonly located in major and minor salivary glands. ACC accounts for 23% of malignant salivary gland tumors, but most of the tumors occur in the minor salivary gland [20]. Most common localization of the ACC is hard palate [27]. Perineural invasion of ACC is more common and allows the tumors to spread the parapharyngeal space or intracranial tissues that can be determined with MRI or CT [19]. CT scans demonstrate the ACC isodense to muscle [10]. This tumor has no specific imaging features and represents hypoechoic cystic mass on US images. Postcontrast MRI demonstrates the nerve enhancement and enlargement in perineural invasion [20]. This tumor has intermediate signal intensity on T1-W images and slightly high signal intensity on T2-W images [28] (Fig. 11.5).

Fig. 11.5A 28-year-old female patient with adenoid cystic carcinoma, (a) T1-W image isointense to hypointense compared to muscles (arrow), (b) T2-W image high signal intensity with different signal intensity areas, (c) T1 C+ Mr. showing the spread of the tumor into the masticator space through TMJ area, (d) coronal T1-W image showing the extend and spread of the lesion into cranial fossa, (e) T2-W images showing perineural spread using fossa pterygopalatine (arrow), (f) STIR images also showing clearly perineural spread (arrow)

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