Thyroglossal Duct Cyst in the Floor of Mouth: An Unusual Finding Volume 1 - Issue 5

Fuenmayor LG¹*, Liceaga R², Mosqueda A³ and Bustos LM⁴

• ¹Oral Surgery Department, Autonomous University of Baja California, Mexico
• ²Oral and Maxillofacial Surgery Department, General Hospital of Campeche, Mexico
• ³Oral and Maxillofacial Pathology Department, Autonomous Metropolitan University, Mexico
• ⁴Oral and Maxillofacial Surgery Department, Autonomous University of Aguascalientes, Mexico

Received: March 21, 2018;   Published: March 26, 2018

Corresponding author: Fuenmayor LG, Dentistry Coordinator, School of Health Science Valle de las Palmas, Autonomous University of Baja California. Boulevard Universitario numero 1000, Baja California, Mexico, P.C 22260

DOI: 10.32474/MADOHC.2018.01.000122

Abstract PDF

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Abstract

The cyst of the thyroglossal duct is a benign congenital malformation, in which the thyroglossal conductor fails to obliterate, before descending towards the thyroid gland. (TDC) is one of the most frequent pathologies found in the midline of the neck. Approximately 7% of the population has thyroglossal remnants, which represents 70% of the head and neck pathologies. We Present a case of a 45-year-old male patient attended consultation with Maxillofacial Surgery referring to difficulty in swallowing and episodes of sleep apnea. Under General anesthesia, and nasotracheal intubation the lesion was removed with no further recurrence or the lesion.

Introduction

The thyroglossal duct cyst (TDC) is one of the most frequent pathologies found in the midline of the neck. Approximately 7% of the population has thyroglossal remnants, which represents 70% of the head and neck pathologies [1]. It is important to point out that, although the thyroglossal duct cyst occurs mainly in children; It can also occur in adults. Most of these are near the hyoid bone, however, they can be located anywhere on the descending path to the thyroid cartilage [2]. 85% of the cases are below the hyoid bone [3]. The understanding and knowledge of both embryology and the anatomy of the tongue are necessary for successful treatment [4,5].

Case Report

A 45-year-old male patient attended consultation with Maxillofacial Surgery referring to difficulty in swallowing and episodes of sleep apnea; as well as changes in the tone of the voice. Clinically, there is an increase in volume in the floor of the mouth, which protrudes the tongue and causes dysphonia (Figure 1). The patient had been treated by Otorhinolaryngology for the difficulty in breathing and at the time of the consultation came with a Waters X-ray only. He is later indicated computed tomography; where hypodense image can be observed for soft tissues of approximately 10mm x 5mm x 8mm, located on the floor of the mouth above the mylohyoid muscle (Figure 2). An aspiration puncture was made, in which whitish liquid without odor was observed. It was decided to plan the surgical excision under general anesthesia. Within the differential diagnoses that we had contemplated were; Dermoid cyst, epidermoid cyst, cystic hygroma, plunging ranula. Under General anesthesia, and nasotracheal intubation. An incision is made on the floor of the mouth horizontally, above the sublingual caruncle; (Figure 3) by blunt dissection the lesion is completely dissected (Figure 4) until its complete excision in a single piece (Figure 5). The Piece is sent to histopathological study where it is diagnosed as Thyroglossal Duct Cyst. The main histological findings were. A cystic wall of loose fibrous tissue, well vascularized, surrounded by bundles of striated muscle and adipose tissue of normal characteristics. The cavity is lined by a pseudostratified ciliated cylindrical epithelium, without findings of malignancy (Figures 6 & 7). Due to the unusual location of this entity in the sublingual region, in the floor of mouth, as well as the few reports of the literature we saw ourselves in the task of making the report of this case.

Figure 1: Clinical view of the lesion, we observed the elevation of the floor mouth and tongue.

Figure 2: CT image coronal view. Size of the pathology can be determinate.

Figure 3: Horizontal incision over the floor of mouth prior to resection.

Figure 4: Complete dissection and resection of the lesion.

Figure 5: Clinical we of the lesion after the complete resection.

Figure 6: Histological findings, a cystic wall of loose fibrous tissue, well vascularized, surrounded by bundles of striated muscle and adipose tissue of normal characteristics.

Figure 7: The cavity is lined by a pseudo stratified ciliated cylindrical epithelium, a Thyroglossal Duct Cyst was confirmed.

Discussion

The cyst of the thyroglossal duct is considered to be a benign congenital malformation, in which the thyroglossal conductor fails to obliterate, before descending towards the thyroid gland [6]. The QCT is the second most frequent neck pathology in pediatric patients, after lymphadenopathy [7]. It can present at any age, being more commonly observed during childhood, at approximately 5 years, however one third of these cysts are visible after [8]. There are 4 common locations. Intralingual (2.1%), suprahyoid, (24%) Tirohyoid (60.9%) and suprasternal [9]. (12.9%) Although, they have also been reported in up to 6 locations [6]. Our case is one of the least frequent locations reported. When the cyst appears in the neck and enucleation is performed; it is common to expect recurrence, so the recession of the hyoid has been suggested [10]. Promulgated by Changle in 1893 with a relapse of 20% and later by Sistrunk which eliminated the remaining tissue of the hyoid, reducing the recurrence by 3% [11]. However, when it is presented in the oral cavity and its enucleation is performed, no recurrence has been reported like the case presented. Factors that have been associated with the occurrence of these cysts in unusual locations include the presence of an ectopic foramen cecum, an abnormal route in the descent of the hyoid, and a lateral branch of the thyroglossal duct [12,13].

Histologically, the cystic wall is lined by a columnar epithelium; Thyroid tissue and mucus-producing cells which can also be isolated sometimes in the area [14]. In our case, a cystic capsule composed of a lax tissue epithelium was present and the epithelium was a columnar pseudostratified columnar type, although they were not isolated remnants of thyroid tissue in the lesion. Cysts of the Tiroglosal duct are rarely associated with ectopic thyroid tissue, although, occasionally associated with the lingual thyroid; which is presented as an increase in volume at the base of the tongue [15]. Only 1% of cases show malignancy data. Cases of incidental findings of primary thyroid papillary carcinomas in TDC have also been reported [16-18].

Conclusion

The thyroglossal duct cyst in the sub lingual region is one of the less frequent reported locations, unlike its usual presentation in the neck. The treatment of this lesion is surgical, a computed tomography its necessary to determine the approach and extension of the same one. It is also recommended to perform ultrasound and rule out the presence of lingual thyroid. Once the lesion was eliminated, the symptoms of dyspnea and dysphonia disappeared, as well as swallowing. Although in this case it was not mandatory to perform the classic Sistrunk technique, the patient evolved satisfactorily and without recurrence of the lesion.

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