A proposed system for redefining of the zones of the scalp

Boylan, Conor T; Gaston, Michaela S; Merwaha, Puja

doi:10.4103/ijt.ijt_119_20

Cited by 1 publication

(3 citation statements)

References 5 publications

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“…Borders and zones of the scalp were defined using a previously described nomenclature dividing the scalp into seven distinct areas: 3 Forehead: the area between the anterior hairline superiorly, supraorbital ridge inferiorly, and temporal ridges laterally Frontal scalp: the area on the top of the head from roughly in line with the midpoint of the zygomatic arch to the anterior hairline Midscalp: the area between the frontal scalp and vertex, bordered laterally by the temporal/parietal hair fringes Vertex: a somewhat oval-shaped region in the posterior scalp overlying the lambda that is the typical site of the hair whorl in men Posterior scalp: the area overlying the occiput from vertex superiorly to superior nuchal line inferiorly and laterally to the mastoid portion of the temporal bone Temporal scalp: the lateral area of the head superior to the zygomatic arch and between the forehead and posterior scalp Posterior auricular area: from the posterior of the ears to the anterior margin of the posterior scalp. …”

Section: Methodsmentioning

confidence: 99%

“… 2 To describe the zones of the scalp, this article will be using a previously defined nomenclature. 3 …”

Section: Introductionmentioning

confidence: 99%

“…2 To describe the zones of the scalp, this article will be using a previously defined nomenclature. 3 Squamous cell carcinoma (SCC) is typically caused by ultraviolet sun damage and thus is a frequent occurrence on the oft-exposed face and scalp. 4,5 It is the second most common cancer worldwide 6 and is increasing in prevalence annually in the United Kingdom.…”

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confidence: 99%

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Assessing the accuracy of computed tomography in detecting bony invasion and thickness of squamous cell carcinoma of the scalp

et al. 2021

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Objectives The aim of this study was to ascertain the accuracy of computed tomography (CT) in assessing the presence of bony involvement and thickness of squamous cell carcinoma (SCC) of the scalp. Methods A single-centre retrospective chart review was carried out. Inclusion criteria were scalp SCC, CT between January 2008 and 2018, and the availability of a reference test. Reference tests were either histology, surgical notes or clinical notes. Tabular assessment of accuracy was performed and Student’s t-test, Mann–Whitney U test and Fisher exact test were used in univariable analysis. Accuracy of thickness measurement was calculated using the limits of agreement method, and linear regression was used to examine trend. Results Thirty-nine patients were included. Most patients were male (74.4%), white (97.4%), not immunosuppressed (66.6%) and had poorly differentiated tumours (33.3%). The most common tumour sites were the vertex (28.2%) and temporal region (23.1%). Sensitivity of CT in detecting presence or absence of bony invasion of scalp SCC was 76.9% (95% CI 46.2–94.9%) and specificity was 96.2% (95% CI 80.4-99.9%). Overall accuracy was 89.7% (95% CI 75.8–97.1%), positive predictive value was 90.1% (95% CI 58.7–99.8%) and negative predictive value was 89.3% (95% CI 71.8–97.7%). No significant differences were found comparing patients with an accurate or inaccurate CT scan. Thickness on CT was found to be consistent with histological thickness at the 95% confidence level. Conclusions CT is accurate at assessing the presence of bony involvement and thickness of scalp SCC. This study was limited somewhat by small sample size.

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