Obstructive Sialoadenitis Role of Interventional Sialography
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Original Article OBSTRUCTIVE SIALOADENITIS ROLE OF INTERVENTIONAL SIALOGRAPHY Muhammad Ovais Aslam1, Aftab Ahmed 2, Muhammad Arqam Awais3 ABSTRACT: The Salivary stones and strictures are the most The interventional sialographic procedures can be common cause of unilateral parotid or used to remove salivary duct stones and is submandibular gland swelling. Traditionally, these treatment of first choice in salivary duct strictures. patients treated by open surgery submandibular For stone removal and stricture dilatation local stones are still the most common cause of anesthesia, I/V cannulas of different sizes, balloon submandibular gland resection parotid gland dilators and wire baskets are used under resection is less frequent as it is major surgical fluoroscopy. The wire guided sialographic procedure with postoperative complication like technique (1) is used for sialography and the I/V cannula used for sialography is used as access for facial nerve paresis. The common cause of stone interventional sialography. The stones in the formation is obstruction, stricture formation intraglandular ducts, large stones and distal stones leading to stasis of saliva, dehydration, change in near the hilum of the gland are difficult to remove salivary pH associated with oropharngeal sepsis. and the small size mobile stones can be easily Over the last two decades, increasing awareness removed. for minimally invasive treatment and with KEYWORDS: development of interventional radiological Salivary gland, Salivary stone, Salivary duct procedures for the management of obstructive stricture, Salivary fistula, obstructive sialoadenitis, sialadenitis has led to avoid surgical removal of Interventional Sialography. gland and complications associated with surgery. OBSTRUCTIVE SIALOADENITIS ROLE OF INTERVENTIONAL SIALOGRAPHY The Salivary calculi and strictures are the most Aslam M O 1 common cause of Obstructive Sialoadenitis. Professor of Radiology Patient present with recurrent painful periprandial KEMU, Lahore unilateral diffuse swelling of the gland due to mechanical obstruction of the main salivary duct known as the "meal time syndrome" (2). The Ahmed A.2 obstruction can remain transitory or can be Consultant Surgeon complicated by bacterial infection (3,4) and Liaquat National Hospital, patient also has fever and purulent discharge from Karachi the ostium of the duct (5) . Traditionally, these patients treated by open surgery submandibular Awais MA3 stones are still the most common cause of submandibular gland resection (6.7) parotid gland House Officer resection is less frequent as it is major surgical CMH, Lahore procedure with postoperative complication like facial nerve paresis. 23 | ANNALS VOL 20, ISSUE 1, JAN. MAR. 2014 Muhammad Ovais Aslam, Aftab Ahmed, Muhammad Arqam Awais Sialolithiasis is comparatively more common in Ultrasography using real time small parts probe is male patients (8). The age of presentation is the first investigation of choice in many centers as between 30 and 60 years (9), and is less commonly it is redialy available. The most important role of seen in children only 3% is seen in pediatric age ultrasound is to differentiate normal and group (10). pathological salivary glands especially when the Submandibular gland more commonly effected by swelling is at the region of salivary glands from sialothiasis 60-80% of cases (10), 20% are parasailomas. Its sensitivity and specivity is radiolucent. Parotid stones effects 15-20% cases, around 80% for detection of stones (19). 40% are radiolucent. Most of these calculi are Spiral multislice CT scan can be used to detect located in the distal third of the duct or at the salivary stones and can be used to rule out salivary hilum of the gland few stones are in the stone as cause of salivary galand swelling. intraglandular ducts (11). The minor salivary Magnetic resonance (MR) sialography is glands and sublingual glands are rarely effected by becoming popular for diagnosis of salivary gland the sialothiasis (12). pathologies. MR Sialography has several Pathophysiology of stone formastion are advantages, no contrast medium is needed, there is obstruction, stricture formation leading to stasis of no radiation and no cannulation of the duct is saliva, dehydration, change in salivary pH required. It can be performed during acute associated with oropharngeal sepsis and impaired inflammation. An extra sequence after use of crystaslloid solubility. lemon juice provide functional evaluation of the The hypothysis to stone formation are related to affected gland (20). 3-dimensional reconstruction Anatomy of the duct its Upward route, Longer and imaging and MR virtual endoscopy for salivary curved duct and components of saliva like mucus gland ducts are new diagnostic approach as a non- protein and calcium contants. invasive pre-surgical procedure. The The annual growth rate of salivary stones has been disadvantages are in-availability, lack of expertise, estimated to be 1 mm per year (13) The have high cost of equipment and procedure. different shpes, most common are oval, they can Sialoendoscopy is emerging technology and is be round, oval or irregular. According to 2 useful in detecting ductal anomalies and can be studies(14,15) the size ranges from 2 mm to 2 cm, used as therapeutic procedure. with the mean being 3.2 mm and 4.9 mm for APPLIED ANATOMY OF MAJOR SALIVARY parotid and submandibular stones, respectively. GLANDS Strictures are the second most common cause of Submandibular Gland: obstructive sialadenitis (16). Parotid duct strictures Wharton's duct is also referred as submandibular are common than submandibular strictures and duct is almost 5 cm in its length and 1-2mm in account for up to 25% of recurrent parotid duct diameter. It begins by numerous branches from the swelling. Females are more effected than males. deep surface of the gland, and runs forward The etiologic factors include are trauma, infection, upward and medially at 45 degree angle to sagittal scar, anatomy of the ductal system. Other causes and horizontal planes between the mylohyoid, of obstructive sialoadenitis are foreign bodies, hyoglossus, and genioglossus. At mylohyoid the kinks, mucus plug and compression by the duct curves around the muscle forming acute angle neoplasm. Less likely causes can be enlarged this is the most comon site for stone formation and intraparenchymal parotid lymph nodes, intraductal ductal kink. It opens by a narrow orifice on the polyp, or the granulation tissues associated with summit of a small papilla at the side of the immunological disorders such as Sjögren's frenulum of the tounge. syndrome (17,18). Parotid Gland: DIAGNOSTIC APPROACH: Main parotid duct (Stenson's duct) is horizontally Sialography is still Gold standard for Obstructive oriented approximately 6-7cms long, is thicker and Sialadenitis, no absolute contraindication, relative double the diameter of the Wharton's duct. It rests contraindication can be Severe inflammation of over the masseter muscle it makes a right angle ducts and history of contrast sensitivity. turn to penetrate the buccinators then opens into the vestibule of the mouth across from the ANNALS VOL 20, ISSUE 1, JAN. MAR. 2014 | 24 OBSTRUCTIVE SIALOADENITIS ROLE OF INTERVENTIONAL SIALOGRAPHY maxillary second molar tooth on the inner surface identify the duct openig. Gently insert 0.5-1cm of the buccal mucosa. The accessory duct if guidewire into the duct, slide I/V cannula over the present arises at an acute angle in the mid portion. guidewire into the duct while removing the The acute angle at distal portion of the duct can guidewire. Take care to remove air bubbles from cause deep cannulation difficult it can be over cum the cannula hub. Most of the times the saliva come by little pull of the cheek. up and fills the hub, if saliva is not filling the hub MATERIALS AND METHODS: air can be displaced by contrast injected with SIALOGRAPHY EQUIPMENT needle tip at the base of the hub of the cannula. Connect with connecting tube attached with I/V cannula 24G or 26G contrast filled syringe and gently inject contrast, Guide wire (Flexable Steel wire or prolene) ask the patient to hold the tube between lips. Make Connecting tube and 5cc syringe. position of patient on fluroscopy table and expose Water soluble contrast. the films, more contrast can be injected during SIALOGRAPHIC PROCEDDURE: fluroscopy if needed. Remove the cannula during Wire guided sialography technique is used(1). Dry fluroscopy to see emptying of contrast from the mucosa of gland with gauze, milk gland oriface or ducts to rule out stasis indicative of stricture. use lemon juice to produce a drop of saliva to . Normal Parotid sialogram (intraglandular ducts) Normal Parotid Sialogram (Stenson's duct) Normal Submandibular Sialigram 25 | ANNALS VOL 20, ISSUE 1, JAN. MAR. 2014 Muhammad Ovais Aslam, Aftab Ahmed, Muhammad Arqam Awais PATIENT SELECTION: The stone in the intraglandular ducts are difficult angioplasty balloon, steel baskets, grasping to remove. The freely mobile stones in the main forceps, wire loop vascular snare, or an ducts can be remove. The small size stones with embolectomy catheter. All performed procedure AP diameter bigger than 7mm are difficult to under fluoroscopic control. remove. Select the stone according to availability The technique described below is the one we are of dilating balloon size 1mm less than the diameter using for interventional sialographic procedures. of balloon size is required the length of the stone is EQUIPMENT: not a consideration. I/V