Isolated agenesis of the mastoid antrum

AbstractThe first isolated case of agenesis of the mastoid antrum, previously only described in association with the congenital syndromes trisomy 13 and mandibulofacial dysostosis, is reported. The loss of this important surgical landmark may result in disorientation and iatrogenic trauma. The surgeon must be aware of its existence, and where it is suspected the middle fossa dura should be exposed and followed posteriorly until the lateral sinus is encountered.

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V. To Determine the Location of the Lateral Sinus from External Markings. Also, the Approach to the Mastoid Antrum, as Modified by Surface Markings

Annals of Otology Rhinology & Laryngology ◽

10.1177/000348941802700105 ◽

1918 ◽

Vol 27 (1) ◽

pp. 116-136 ◽

Cited By ~ 1

Author(s):

H. J. Prentiss

Keyword(s):

Lateral Sinus ◽

Mastoid Antrum

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Extradural Hæmorrhage in the Middle Fossa Arising from the Lateral Sinus

The Journal of Laryngology & Otology ◽

10.1017/s0022215100011014 ◽

1943 ◽

Vol 58 (3) ◽

pp. 117-119 ◽

Cited By ~ 1

Author(s):

Stephen Suggit

Keyword(s):

Lateral Sinus ◽

Middle Fossa

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Retrolabyrinthine Surgery: A Direct Approach To The Cerebellopontine Angle

Otolaryngology ◽

10.1177/019459988008800425 ◽

1980 ◽

Vol 88 (4) ◽

pp. 462-469 ◽

Cited By ~ 48

Author(s):

Herbert Silverstein ◽

Horace Norrell

Keyword(s):

Cerebellopontine Angle ◽

Cranial Nerves ◽

Significant Advance ◽

Lateral Sinus ◽

Middle Fossa ◽

Vestibular Neurectomy ◽

Otologic Surgery ◽

Direct Route ◽

Retrolabyrinthine Approach ◽

Suboccipital Approach

The direct route to the cerebellopontine (CP) angle through the ear (retrolabyrinthine approach) represents a significant advance in neuro-otologic surgery. After incising the dura between the endolymphatic sac and the lateral venous sinus, a self-retaining retractor is used to collapse the lateral sinus, which provides a wide exposure of the CP angle, with visualization of the 5th through 11th cranial nerves. The retrolabyrinthine approach is a safe and direct route to the CP angle and has advantages over the suboccipital approach. Vestibular neurectomy through the retrolabyrinthine approach is the most frequently performed procedure and has replaced middle fossa vestibular neurectomy in our practice.

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