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Obliquity of the Stapes in Otosclerosis: A New Radiological Sign.

Anand V, Udayabhanu HN, Subramaniam BS - Int Arch Otorhinolaryngol (2016)

Bottom Line: Results An increased mean distance between the horizontal segment of facial nerve and stapes head in otosclerotic patients (i.e., 2.49mm +/- 0.24mm SD), when compared with the non-otosclerotic patients (i.e., 1.46mm +/- 0.16mm SD) is noted.There is a change in angle (i.e., 64.550 +/- 7.190 SD) subtended by the stapes toward the promontory in otosclerotic ears when compared with that of controls (i.e., 99.700 +/- 40 SD).We applied the Mann-Whitney U non-parametric test and considered p value of < 0.0001 highly significant.

View Article: PubMed Central - PubMed

Affiliation: Department of Otorhinolaryngology and Head and Neck Surgery, MCV Memorial ENT Trust Hospital, Pollachi, Tamil Nadu, India.

ABSTRACT
Introduction Observing the obliquity of stapes by closely scrutinizing the HRCT temporal bone in otosclerosis revealed a reliable and consistent finding. This finding can add to the existing radiological criteria in diagnosis of otosclerosis. Objective The objective of this study is to establish the obliquity of stapes in otosclerosis by radiological measurements using HRCT temporal bone by comparing: (a) the distance between the horizontal (tympanic) segment of facial nerve and stapes head in otosclerotic ears (study group) with non-otosclerotic ears (control group); and (b) the angle subtended by stapes with promontory in the study and control groups. Methods This is a prospective study performed after the institutional Ethics Committee clearance (IEC 3/2013). Results An increased mean distance between the horizontal segment of facial nerve and stapes head in otosclerotic patients (i.e., 2.49mm +/- 0.24mm SD), when compared with the non-otosclerotic patients (i.e., 1.46mm +/- 0.16mm SD) is noted. There is a change in angle (i.e., 64.550 +/- 7.190 SD) subtended by the stapes toward the promontory in otosclerotic ears when compared with that of controls (i.e., 99.700 +/- 40 SD). We applied the Mann-Whitney U non-parametric test and considered p value of < 0.0001 highly significant. Conclusions Obliquity of stapes in otosclerosis referred to as a "Pisa" sign by the senior author has diagnostic value as a new radiological sign in imaging of otosclerosis. This obliquity explains the torsional effect of otosclerosis on the ossicular chain. The findings correlate with late complications and failures in stapes surgery.

No MeSH data available.


Related in: MedlinePlus

Illustration showing the increase in length from facial nerve to stapes head due to obliquity of stapes in otosclerosis (dotted line).
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getmorefigures.php?uid=PMC4835337&req=5

FI0346or-1: Illustration showing the increase in length from facial nerve to stapes head due to obliquity of stapes in otosclerosis (dotted line).

Mentions: A straight line was drawn to measure distance between the mid horizontal (tympanic) segment of facial nerve and stapes head in coronal sections using syngo software in both the study and control groups (Fig. 1).


Obliquity of the Stapes in Otosclerosis: A New Radiological Sign.

Anand V, Udayabhanu HN, Subramaniam BS - Int Arch Otorhinolaryngol (2016)

Illustration showing the increase in length from facial nerve to stapes head due to obliquity of stapes in otosclerosis (dotted line).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4835337&req=5

FI0346or-1: Illustration showing the increase in length from facial nerve to stapes head due to obliquity of stapes in otosclerosis (dotted line).
Mentions: A straight line was drawn to measure distance between the mid horizontal (tympanic) segment of facial nerve and stapes head in coronal sections using syngo software in both the study and control groups (Fig. 1).

Bottom Line: Results An increased mean distance between the horizontal segment of facial nerve and stapes head in otosclerotic patients (i.e., 2.49mm +/- 0.24mm SD), when compared with the non-otosclerotic patients (i.e., 1.46mm +/- 0.16mm SD) is noted.There is a change in angle (i.e., 64.550 +/- 7.190 SD) subtended by the stapes toward the promontory in otosclerotic ears when compared with that of controls (i.e., 99.700 +/- 40 SD).We applied the Mann-Whitney U non-parametric test and considered p value of < 0.0001 highly significant.

View Article: PubMed Central - PubMed

Affiliation: Department of Otorhinolaryngology and Head and Neck Surgery, MCV Memorial ENT Trust Hospital, Pollachi, Tamil Nadu, India.

ABSTRACT
Introduction Observing the obliquity of stapes by closely scrutinizing the HRCT temporal bone in otosclerosis revealed a reliable and consistent finding. This finding can add to the existing radiological criteria in diagnosis of otosclerosis. Objective The objective of this study is to establish the obliquity of stapes in otosclerosis by radiological measurements using HRCT temporal bone by comparing: (a) the distance between the horizontal (tympanic) segment of facial nerve and stapes head in otosclerotic ears (study group) with non-otosclerotic ears (control group); and (b) the angle subtended by stapes with promontory in the study and control groups. Methods This is a prospective study performed after the institutional Ethics Committee clearance (IEC 3/2013). Results An increased mean distance between the horizontal segment of facial nerve and stapes head in otosclerotic patients (i.e., 2.49mm +/- 0.24mm SD), when compared with the non-otosclerotic patients (i.e., 1.46mm +/- 0.16mm SD) is noted. There is a change in angle (i.e., 64.550 +/- 7.190 SD) subtended by the stapes toward the promontory in otosclerotic ears when compared with that of controls (i.e., 99.700 +/- 40 SD). We applied the Mann-Whitney U non-parametric test and considered p value of < 0.0001 highly significant. Conclusions Obliquity of stapes in otosclerosis referred to as a "Pisa" sign by the senior author has diagnostic value as a new radiological sign in imaging of otosclerosis. This obliquity explains the torsional effect of otosclerosis on the ossicular chain. The findings correlate with late complications and failures in stapes surgery.

No MeSH data available.


Related in: MedlinePlus