Central Annals of Otolaryngology and Rhinology

Case Report *Corresponding author

Ernesto Pasquini, Ear, Nose and Throat Metropolitan Unit-Azienda Unità Sanitaria Locale di Bologna, Endoscopic Treatment for Nasal Bellaria Hospital, Via Altura, 3, 40139 Bologna, Italy, Tel: 39-051-4966224; Email: Dermoid Sinus : A Report of 6 Submitted: 06 June 2016 Accepted: 06 July 2016 Pediatric Cases Published: 07 July 2016 Ernesto Pasquini1* and Giacomo Sollini2 ISSN: 2379-948X 1Ear, Nose and Throat Metropolitan Unit – AUSL Bologna, Italy Copyright 2Department of Otorhinolaryngology-Head and Neck , University of Genoa, Italy © 2016 Pasquini et al.

OPEN ACCESS Abstract Keywords Nasal dermoid sinus are the most common congenital midline nasal lesions. • Nasal dermoid sinus cyst The frequency of intracranial extensions varies from 5% to 45%. Complete surgical • Nasal dermoid excision of nasal dermoid cyst and any associated sinus tract is essential for cure and • Endoscopic sinus surgery any residual ectodermal elements result in a high rate of recurrence and complicated • Nasal benign tumor . • Congenital midline mass Many different approaches have been described for the removal of nasal dermoids, ranging from a simple extracranial excision to complex procedures in which a combined extracranial–intracranial approach is required. We hereby report six cases of nasal dermoid sinus cysts in children (5 with intracranial extension) which were managed with an endonasal endoscopic procedure. We describe the technique we implemented for this procedure and for the reconstruction of the skull base defect.

ABBREVIATIONS region to the base of the columella, and may be associated with NDSC: Nasal Dermoid Sinus Cyst; CSF: amass, sinus most opening. commonly Intermittent along the discharge dorsum from of sebaceous the naso-glabellar material INTRODUCTION and recurrent are also common. Even if it is present in less than half of patients, hair protruding through a punctum is Nasal dermoid sinus cysts (NDSCs) are the most common pathognomonic for nasal dermoid, [14]. congenital midline nasal lesions [1,2], accounting for over 60% of all the midline nasal lesions in children [3], for 1–3% of all as aural atresia, deformity of the pinna, mental retardation, dermoid cysts, and for 4–12% of head and neck dermoids [4–7]. ,The frequency lacrimal of associated duct cysts, multiplehydrocephalus, anomalies pharyngeal (such Midline congenital lesions of the nose, consisting of nasal arch sinus, , hemifacial microsomia and cleft/lip dermoid sinus cysts, glioma and are rare palate) greatly varies in literature, ranging from 6% to 41%, congenital anomalies. Their incidence is estimated at 1:20.000 [2,4,10,11,15]. deformities, benign neoplasms, malignant neoplasms, congenital to 1:40.000 births [8,9]. Inflammatory lesions, post-traumatic from 5% to 45% [4,10,15–18]. Several degrees of extensions are and vascular masses have to be excluded [7]. distinguished.In literature, The the great frequency majority of intracranialremain extradural. extensions Intradural varies extensions with involvement of brain parenchyma has also been dermoid sinus cyst to include all the lesions in the nose containing reported [1,19–23]. Computed tomography (CT) and magnetic Sessions [10] was the first to coin the expression nasal resonance imaging (MRI) scans are the gold standards in the (adnexal structure). radiographic evaluation of nasal dermoid, and each modality (stratified squamous epithelium) and mesoderm offers complementary information for the diagnosis and the Its pathogenesis involves the incomplete obliteration of neuroectoderm in the developing frontonasal region [9]. surgical planning. determination of the extent of the lesion, as well as allows pre- Nasal dermoid is usually visible at birth or in early infancy and Progressive enlargement of a nasal dermoid can cause soft the mean age of presentation varies from 14 to 34 months, with tissue and skeletal deformity, local infection, , and a slight male predominance [2,10–12]. A familial basis has been brain . Timely diagnosis is, therefore, essential, and suggested [3,13]. Nasal dermoid typically presents as a midline surgical excision is the only therapeutic modality.

Cite this article: Pasquini E, Sollini G (2016) Endoscopic Treatment for Nasal Dermoid Sinus Cyst: A Report of 6 Pediatric Cases. Ann Otolaryngol Rhinol 3(8): 1124. Pasquini et al. (2016) Email: Central

Many different approaches have been described for the Table 1: Patient Demographics, Presentation and Investigation. removal of nasal dermoids in the past two decades, ranging from a simple extracranial excision to complex procedures in which Pt Age Gender Extension Presentation Investigation Intracranial 1 3 M Sinus Infection CT/MRI this paper, we report six cases of NDSCs in children that were extradural a combined extracranial–intracranial approach is required. In managed with an endonasal endoscopic procedure. We describe Intracranial Sinus Infection, 2 5 F CT/MRI extradural Discharge reconstruction of the skull base defect. Intracranial 3 5 F Sinus Infection CT/MRI the technique we implemented for this procedure and for the extradural CASE PRESENTATION Intracranial 4. 2 M Sinus Infection CT/MRI From September 2007 until January 2015 we performed extradural Intracranial 6 endonasal endoscopic procedures in pediatric patients. The 5 4 M Sinus Infection CT/MRI extradural mean age was 5.8 yy (range from 2 to 16 years), two patients Sinus Infection, were female and four male. 6 16 M Extracranial CT/MRI Discharge All the cases came to our attention with a history of nasal Abbreviations: Pt: Patient; F: Female; M: Male; CT: Computer midline recurrent infections often with intermittent discharge. Tomography; MRI: Magnetic Resonance Imaging Physical examination revealed in all patients a draining sinus opening on the nasal dorsum with a protruding hair. 2 patients Considering the limited anatomical space, normally we proceed by emptying the cyst contents, trying to preserve the Figure (1d) in the right and left paranasal area respectively. 3 integrity of the walls. The next step concerns the subperiosteal childrenpresented had a cutaneous an intense fistula swelling Figure glabellar (1a) and extended a cutaneous to the abscess frontal dissection of the cyst walls from the surrounding bony structures, generally within the crista galli, until the superior insertion of the region Figure (1b-e). cyst (intracranial extradural) in the falxcerebri is identified. The All the patients underwent CT scan and MRI with gadolinium the use of cutting instruments with unavoidable CSF leak. The other head and neck findings were within normal limits. cyst may be so toughly adherent to the dural plan, that, is required that shown in 5 of 6 cases intracranial extradural extension. No Once the cyst is radically removed, it is necessary to proceed from the cyst out to the nasal dorsum was detected in all the portion on the nasal dorsum. cases.intradural Details extention of patients was and reported. their presentation A fistulous tractare included extending in to the second part of the surgery, the removal of the fistulous To do that, a perilesional elliptic incision is carried out by is positioned, under general anesthesia, in a semi recumbent (Table 1). Our surgical technique is described below. The patient Under endoscopic control occurs the actual removal of the position with head extended. A nasal decongestion with 5% deeply following the fistulous tract penetrating the nasal bones. Xylocaine (R) is performed. We proceed, after subperichondrium fistulousIn order intranasal to reduce tract. granulation and, when necessary, to superior portion of the nasal septum which also includes the perform dural plasty, after regularization of perilesional bone dissection, to endonasal endoscopic resection of the antero- margins, mucoperiosteum from the resected portion of nasal maneuverability through a bilateral nasal access. septum is taken and positioned on the exposed bone and dural upper portion of the fistula in order to increase the surgical surface. Cartilage from the removed portion of the septum can also be used to close the skull base defect (Figure 2). Absorbable nasal packing kept in place for 1 day in the patient without CSF

leak and 2-3 days in the other cases. in all the cases. All the lesions were extradural, but in 2 cases the lesionsWe achievedwere adherent the radical to the remove dura and of cystwe had and to fistulous remove portion part of the dura itself; the defect was then successfully repaired with a

cartilage A post operative CT scan was performed in all the cases tofree, control nasal the septal presence mucoperichondrial of any residual and flap the alone closure or with of the septal skull base defect (Figure 3). No complications occurred during and after surgery and, particularly, no post operative CSF leak occurred. Nowadays (minimum follow up of 18 months) no recurrence of NDSC is reported. In only one case (case no.6) we had to Figure 1

Pre-operative images showing the typical midline or para- theperform time of6 monthsthe previous after surgerythe first (Table surgery, 2). in local anesthesia, an median mass with sinus opening in nasal dorsum in our 6 cases. (A)- external removal of a second fistulous tract that wasn’t evident at case 1; (B)-case 2 ; (C)-case 3; (D)-case 4 M; (E)-case 5 ; (F)-case 6. Ann Otolaryngol Rhinol 3(8): 1124 (2016) 2/4 Pasquini et al. (2016) Email: Central

DISCUSSION Table 2: Surgical Treatment. I.O. CSF Using a transnasal endoscopic approach the morbidity Pt Approach Reconstruction Complications associated with frontal craniotomy is minimized or eliminated leak Endoscopic when open excision is avoided. The transnasal approach 1 No None endonasal Endoscopic nature of dermoid cysts makes the plane of dissection easy to 2 Yes Mucoperichondrial flap None endonasal manipulate,does not require therefore, frontal a careful lobe retractionpiecemeal resection and the non-invasiveof the tumor Endoscopic 3 No Mucoperichondrial flap None while preserving the underlying neural and vascular structures endonasal should be the main strategy for the operation. The patients had Mucoperichondrial Endoscopic Mucoperichondrial flap excellent postoperative recovery and a shorter hospital stay. All 4 Yes None endonasal patients with NDSCs must be considered as potentially having cartilage an intracranial extension and, therefore, undergo a thorough Endoscopic flapwith septal 5 No None preoperative radiological evaluation [25]. endonasal Endoscopic Second tract to 6 No Mucoperichondrial flap endonasal the skin MRI should be considered if there is concern for intracranial Pt: Patient; I.O. MucoperichondrialCSF: Intraoperative flapCerebrospinal Fluid extension.Workup has to include fine-cut CT, and complementary Abbreviations:

of nasal dermoids with intracranial extension. The endoscopic effective and accurate means of evaluating nasal dermoids and it transnasal skull base approach is an excellent alternative to Some authors considered that MRI alone is the most cost- is essential for preoperative planning [24]. traditional frontal craniotomy in order to achieve the complete In conclusion we can state that, in expert hands, the resection of intracranial dermoid cysts. endoscopic endonasal approach for dermoids that extend to the otolaryngologist and a neurosurgeon in case of intradural extension,The use is of crucial a team-based to the success approach, of the including transnasal an endoscopic anterior cranial fossa is an effective technique for the resection increased morbidity associated with frontal craniotomy. Such endoscopictechnique. The removal aim of has the minimalendoscopic morbidity removal and is to mortality, eliminate andthe better aesthetic results compared with open craniotomy, but it still achieves the complete resection of the tumour. REFERENCES 1. Yavuzer R, Bier U, Jackson IT. Be careful: it might be a nasal dermoid cyst. Plast Reconstr Surg. 1999; 103: 2082–2083. 2. Denoyelle F, Ducroz V, Roger G, Garabedian EN. Nasal dermoid sinus Figure 2 Case 1 (A) – Intraoperative endoscopic aspect of NDSC (B)

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Cite this article Pasquini E, Sollini G (2016) Endoscopic Treatment for Nasal Dermoid Sinus Cyst: A Report of 6 Pediatric Cases. Ann Otolaryngol Rhinol 3(8): 1124.

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