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Investigating the Various Shapes of Sella Turcica in Nigerian Children Using Lateral Skull Radiographs

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Investigating the Various Shapes of Sella Turcica in Nigerian Children Using Lateral Skull Radiographs International Journal of Health Sciences and Research www.ijhsr.org ISSN: 2249-9571 Original Research Article Investigating the Various Shapes of Sella Turcica in Nigerian Children Using Lateral Skull Radiographs Bello A., Usman J.D. Department of Anatomy, Faculty of Basic Medical Sciences, College of Health Sciences, Usmanu Danfodiyo University, Sokoto, Nigeria. Corresponding Author: Bello A ABSTRACT The knowledge of the normal radiographic anatomy of the sella turcica and sella point is of great importance to clinicians in enabling them quickly recognize, investigate or evaluate any deviation from normal as well as any pathological situation related to the pituitary gland. This study investigated the various shapes of the sella turcica in children. A total of 250 lateral skull radiographs taken in the Department of Radiology, Usmanu Danfodiyo University Teaching Hospital (UDUTH), Sokoto from January 2013 to December 2014 were retrieved for the purpose of this study. Radiographs were mounted on the viewing box and variants of the anatomical shapes of the sella turcica were studied and classified. Of the 162 radiographs used in this study, 114 (70.4%) sella turcica were round shaped while 48 (29.6%) oval in shaped. This observed difference was statistically significant (p<0.001). Meanwhile, the floor of the sella turcica of the study participants showed a concave outline in 130 (80%) of the children and flat outline in 32 (20%) of the children. Sexual dimorphism was seen in this study with respect to shape of sella turcica. Round shaped sella turcica was predominant in Nigerian children used in this study. The prevalence and the relative frequencies of the normal variants of the anatomical shapes of the sella turcica of male Nigerian children differ significantly from those of their female counterparts. The morphology and size of sella turcica is of importance because within its center lies sella point which helps in evaluation of craniofacial morphology, orthodontic treatments as well as growth changes. Keywords: Sella turcica, shapes, radiographs, children, Nigeria. INTRODUCTION used cranial landmarks for cephalometric The sella turcica is an important tracing is sella point. The morphology and anatomical structure for cephalometric size of sella turcica is of importance because assessment because of its central landmark; within its center lies sella point which helps it lies on the intracranial surface of the body in evaluation of craniofacial morphology. [2] of the sphenoid and consists of a central On a lateral skull radiograph the pituitary fossa bounded anteriorly by the image of sella turcica is U shaped. A tuberculum sellae and posteriorly by the deviation from normal size and shape of dorsum sellae. [1] sella turcica can be an indication of a The center of sella turcica is pathological condition of the pituitary gland. routinely used as a cephalometric landmark [3] to act as a reference point for evaluating Jones reported that the anatomy of spatial position of both jaws as they relate to the sella turcica is variable in size and shape the cranial base. One of the most commonly International Journal of Health Sciences & Research (www.ijhsr.org) 53 Vol.9; Issue: 1; January 2019 Bello A et.al. Investigating the Various Shapes of Sella Turcica in Nigerian Children Using Lateral Skull Radiographs and classified sella into three types; round, area of sella turcica in males was more, oval and flat. [4] however after age of 17years the sella Gorden and Bell examined turcica area in females is slightly larger radiographs of children of age ranging from compared to males. [14] Plain film 1 year to 12 years, classifying the sella into radiographs have a relatively high 3 shapes; the circular, the oval or the sensitivity for detecting sella change at flat/saucer shaped. Gordon & Bell between 67% and 77% of positive findings concluded that most of the subjects in their and clinicians should be suspicious when study had either circular or oval shaped sella any of the sella turcica dimensions exceed turcica. [5] the upper limits of normal. [15] The sella turcica have been The sella floor is recognized in the described based on the contour of the sella postero-anterior view of the skull film in turcica, the angle made by the contour of over 90% of cases and in 100% of cases tuberculum sella, the contour of the anterior using tomography. [16-18] and posterior clinoid processes and the Bruneton et al. [19] studied 200 fusion of both the processes termed as ‘ radiographs of normal adult from North sella turcica bridge’. [6-8] American and noted the percentage of In a recent study by Axelsson, [9] shape of variants of each anatomical feature on both the sella turcica was divided into six main standard radiograph and tomography. In this types; normal sella turcica, oblique anterior series the floor was concave in 58% of wall, double–contoured sella, sella turcica subjects, flat in 32.5% and convex in 9.5%. bridge, irregularity (notching) in the Thus, the floor of the sella turcica which in posterior part of the sella and pyramidal most cases is concave may be, flat or even shape of the dorsum sellae. [9] The normal convex. [19] variation of sella turcica was seen in 2/3rd The objective of this study was to of the subjects while the remaining subjects describe the shape and floor of the sella showed dysmorphological appearance. [10] turcica in Nigerian children from Sokoto. The variation of the sella turcica morphology apart from normal can be MATERIALS AND METHODS misleading since it may be present in Study Design: normal patients as well as medically All available lateral skull radiographs of compromised patients as seen in spina bifida Nigeria children over a 3-year period from or craniofacial deviation. [11] 2013 to 2014 were retrieved from the In a study by Silverman, [12] of radiology department of the Usmanu children radiographs aged between 1 month Danfodiyo University Teaching Hospital, and 18 years. He reported that pituitary Sokoto, for the study. fossa of males tend to be larger than the This study was a cross sectional females from 1 to 13 years of age. Because comparative study. All the radiographs were of the pubertal growth spurt which occurs 2 ascertained to have been taken by a trained years earlier than males, a significant radiographer in a standardized increase in size of the sella turcica occurs condition/manner (focus to film distance from 11 to 15 years of age in the females. target to film distance (FFD/TFD) OF 40 [12] Thereafter the pubertal growth spurt in inches (100cm). [18] males occurs about 2-3 years later than All the lateral skull radiographs included in females resulting in approximately the study showed clear reproduction of the equalization in sella area in both genders. [12] sella turcica and were of patients 15 years In children, 70% of sella are round, old or below. in adults only 24.4% are round, and whereas The total number of radiographs was two 58% are oval and 17.2% are flat. [13] Haas hundred and fifty (250) and only 162 of reported that till the age of 17 the mean size these satisfied the inclusion criteria. Only International Journal of Health Sciences & Research (www.ijhsr.org) 54 Vol.9; Issue: 1; January 2019 Bello A et.al. Investigating the Various Shapes of Sella Turcica in Nigerian Children Using Lateral Skull Radiographs radiographs interpreted by experienced comparison of proportions. Statistically radiologist were studied. significance was set at p<0.001. Inclusion and Exclusion Criteria Perfect superimposition of the crinoids RESULTS processes, to rule out tilting of the skull A total of 162 subjects were involved in the during positioning of the patient, clear study. Of these number 106 (65%) were visualization and recognition of the dorsum males and 56 (35%) were females (m:f ratio sellae and tuberculum sellae, distinct sella 9:1). The results obtained are summarized in turcica floor so that the shape of the fossa tables 1-4 and its floor could be classified. Syndromic Table 1: Showing the Various Anatomical Shapes of the patients or patients with major illness were Turcica not included. All the lateral skull Shape of the Fossa Frequency Percentage (%) Round 114 70.4 radiographs were taken by the same trained Oval 48 29.6 operator (Radiographer) using GE Haulum Total 162 100 2 medical system X-ray machine model = 128.1; dF = 1; p < 0.001 No.2226519. The various anatomical shapes of the sella Description Techniques: Radiographs were mounted on the viewing turcica of Nigerian children seen in the boxes and variants of the anatomical shapes study are shown in table 1. The predominant of the sella turcica were studied and shape of sella in the Nigerian children studied is round (Figure 1) and the classified according to the method adopted by Bruneton et al. [19] and Zagga et al., [20] difference in frequency of round shaped sella and that of oval (figure 2) type is Statistical Method: 2 Data were entered into the computer highly statistically significant ( =257.1579; Microsoft Excel and Minitab 13.1 statistical df=1;p0.001) package and chi-square was used for Table 2: Table Showing the Various Anatomical Shapes of the Sella Turcica in Relation to Sex. Shape of the floor Frequency Total Males (Number) Percentage (%) Females (Number) Percentage (%) Round 78 73.6 36 64 114 Oval 28 26.4 20 35.7 48 Total 106 100 56 100 162 2=28.0000, df=1; p0.001 With regards to the various anatomical Table 3 shows the difference shapes of the shapes of the sella turcica (round and oval) floor of the sella turcica. The commonest in relation to the sex of the Nigerian type of sella floor in Nigerian children children, this study revealed males to be studied is concave (Figure 1) and the predominant for each of the two shapes of difference in frequency of concave shaped the sella turcica as shown in table 2.
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