|Year : 2018 | Volume
| Issue : 2 | Page : 140-143
Canalis sinuosus mimicking root resorption lesion
Jaydeep Shashikumar Talim1, Daniel Schechter1, Rafael Roges1, Ilan Rotstein2
1 Department of Endodontics, Herman Ostrow School of Dentistry of USC, Los Angeles, CA, USA
2 Division of Endodontics, Herman Ostrow School of Dentistry of USC, Los Angeles, CA, USA
|Date of Web Publication||5-Dec-2018|
Dr. Jaydeep Shashikumar Talim
Department of Endodontics, Herman Ostrow School of Dentistry of USC, 925 W 34th Street, Los Angeles 90089, CA
Source of Support: None, Conflict of Interest: None
Anatomical variations in the premaxillary region, especially those involving neurovascular structures, can present a diagnostic challenge to a clinician. Correct diagnosis is crucial for treatment decision-making and prognosis assessment of nonsurgical and surgical procedures. Canalis sinuosus (CS) is an anatomical variation of the anterior superior alveolar nerve canal. Its diagnosis may sometimes be confusing, resulting in an inadequate treatment plan. Described is a case of a CS mimicking an external root resorption lesion. Cone beam computed tomography (CBCT) assisted in confirming the final diagnosis.
Keywords: Anatomic variations, anterior superior alveolar nerve, canalis sinuosus, cone beam computed tomography, root resorption
|How to cite this article:|
Talim JS, Schechter D, Roges R, Rotstein I. Canalis sinuosus mimicking root resorption lesion. Endodontology 2018;30:140-3
| Introduction|| |
Canalis sinuosus (CS) is a neurovascular canal that carries the anterior superior alveolar nerve and vessels. This neurovascular structure was described leaving the infraorbital foramen and running laterally in a 2-mm diameter bony canal. It turns downward in the anterior wall of the antrum along the lateral wall of the nose and finally tunneling downward around the nasal opening and floor or terminating in the alveolar ridge palatally to the maxillary anterior teeth. Unaware of its presence, a clinician may confuse CS with a lesion of endodontic origin.
Only one case report has been published in the endodontic literature, describing a CS mimicking a periapical radiolucency in a maxillary left canine. Diagnosis was established by using pulp sensitivity test, presence of typical corticated borders, and multiple-angled film-based radiographs, showing a clear periodontal ligament space. Recent radiology and oral maxillofacial surgery literature emphasizes the presence of multiple bony channels of varying diameters, other than the nasopalatine canal (NPC), in the maxillary anterior region. Generally, they are located palatally to the maxillary anterior teeth.,,
Current cone beam computed tomography (CBCT) technology enables a three-dimensional evaluation of the anatomy of the maxilla, including the neurovascular channels. Furthermore, it discloses channels that are <1 mm in diameter that otherwise may not be visible on conventional radiographs.
Presented is a case of an unusual appearance of CS mimicking an endodontic resorptive defect in a maxillary left central incisor. CBCT was used to confirm the final diagnosis.
| Case Report|| |
A 50-year-old Hispanic male was referred for endodontic treatment of a maxillary left central incisor. Medical history was noncontributory. Extra- and intra-oral examinations were normal. The patient reported no history of orthodontic treatment or previous trauma to the region.
Clinically, the crown of the maxillary left central incisor showed discoloration and presence of an old facial and mesioincisal composite restoration. The tooth was not tender to palpation or percussion and was not sensitive upon biting. The pulp was not responsive to thermal and electric tests. Radiographically, periapical radiolucency was evident [Figure 1]. In addition, the junction of the mid-third and apical third of the root showed a well-defined, circular radiolucent area that shifted in position following change of the horizontal radiographic angulation [Figure 1]. The root canal contour could be traced without interruptions or irregularities. The horizontal bone height and density appeared normal.
|Figure 1: (a) Preoperative radiograph showing maxillary left central incisor associated with periapical and mid-root radiolucency. The pulp was not responsive to thermal and electric tests. (b) Radiograph from distal angulation showing location shift of the mid-root radicular radiolucency|
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At this point, a tentative diagnosis of asymptomatic apical periodontitis due to pulp necrosis in the maxillary left central incisor was made. Since the pulp was nonresponsive to pulp sensitivity tests, the outline of the root canal appeared uninterrupted, and the mid-root radiolucency shifted upon changing the horizontal radiographic angulation, the defect was initially considered to be an external root resorption. A CBCT analysis was then prescribed to determine the extent of the lesion and presence of possible communications between the resorptive defect and the root canal system.
CBCT analysis was done using CS 9000 extra-oral imaging system (Carestream Health, New York, USA). Axial slices of the maxillofacial region in 76 μ thickness were reviewed to determine the extent of the lesion. The CBCT analysis showed the presence of a periapical radiolucency surrounding the root apex that extended toward the palatal surface [Figure 2]. No other areas of root abnormality were noted. The mid-root radiolucency was confirmed as CS. It was evident in different sagittal and coronal views [Figure 2].
|Figure 2: (a) Preoperative cone beam computed tomography image of the maxillary left central incisor. Sagittal view showing canalis sinuosus and a palatal periapical radiolucency. (b) Coronal and sagittal views showing canalis sinuosus and palatal periapical radiolucency|
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Nonsurgical endodontic treatment was completed uneventfully, and the patient was recalled after 6 months. At that time, the patient was comfortable and signs of active osseous healing were evident on both conventional and CBCT images [Figure 3].
|Figure 3: (a) Six-month radiograph following endodontic treatment showing evidence of active periapical bone healing. (b) Cone beam computed tomography views|
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| Discussion|| |
Maxillary anterior anatomic variations may often be related to the NPC and are usually diagnosed by aid of conventional radiographs. The NPC has been described as being located in the midline of the palate, posterior to the roots of the maxillary central incisors. The oral opening of the canal is the incisive foramen located underneath the incisive papilla. The average length of the NPC is approximate 10.99 mm, and the average width of the incisive foramen is below 6 mm in diameter. However, the canal can vary significantly in length and diameter and therefore be misdiagnosed. Since the early 2000s, technological developments in CBCT and its increased use in dentistry have contributed to a better understanding of these anatomical variations and neurovascular structures.
CS is a normal unilateral or bilateral anatomical structure that branches off from the infraorbital canal and carries the anterior superior alveolar nerve along with its corresponding veins and arteries. The entire course of the CS is approximately 5.5 cm in length, with the orbital floor part accounting for around 1.5 cm, the transverse facing part around 2 cm, and the circumnarial part around 2 cm. Its width is fairly constant along its whole trajectory. Statistically, no significant differences were found between genders and age groups. The current literature indicates that the incidence of these anatomic variations and accessory canals are not uncommon.,,, The incidence of one or more accessory canals in the anterior maxilla with diameters > 1 mm, other than the NPC, varied between 15.7% and 32.9%. These accessory canals can normally be found palatally to all maxillary anterior teeth, and in some instances, they communicate with the CS.
In this case, CBCT played a role in recognition of CS. A preoperative review of the CBCT to assess anatomical variations can be beneficial to prevent iatrogenic injury to neurovascular structures, avoid complications such as paresthesia and hemorrhage, and improve successful outcomes of diagnostic nonsurgical and surgical procedures in the maxillary anterior area.,,
Several conditions may depict periapical and mid-root radiolucency in the maxillary anterior area and cause confusion in diagnosis. Among those are granulomas, cysts,, periapical scar, ameloblastoma, aberrant salivary gland tissue, periapical cemental dysplasia, carcinoma, iatrogenic procedural errors, root resorption, and normal anatomy such as incisive foramen. These conditions should be included in the differential diagnosis process.
In the case presented, the radiolucency at the junction between the mid-third and apical third of the root of the maxillary left central incisor could have been misdiagnosed as an external root resorption, leading to a more aggressive treatment with possible diagnostic surgery or an endodontic surgery to repair the defect. Care should be exercised when diagnosing the etiology of periapical and mid-root radiolucencies, and CS should not be ruled out.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]