Anatomical observations of the development of the pituitary capsule

G., Je; Lee, Myung Ho

doi:10.3171/jns.1980.52.5.0667

Cited by 26 publications

(7 citation statements)

References 10 publications

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“…There is no consensus on nomenclature for this structure; some reports have referred to a distinct MWCS (Ciric, 1977;Chi and Lee, 1980;Chacko et al, 2003), whereas others have wrongly identified the pituitary capsule as the MWCS (Yokoyama et al, 2001). In all 18 of our specimens (anatomic and histological observations), we observed a definite plane of cleavage between the pituitary gland capsule and the MWCS.…”

Section: Discussionmentioning

confidence: 57%

“…A variety of different surgical approaches to this area have been described (Fahlbusch and Buchfelder, 1988;Origitano et al, 1992;Fraioli et al, 1995;Dolenc, 1997;Kitano and Taneda, 2001;Liu et al, 2001;Day, 2003), however, only a few studies have focused on the medial venous space and the medial wall of the CS (MWCS). The observations documented in these latter reports have been inconsistent (Chi and Lee, 1980;Inoue et al, 1990;Knosp et al, 1993;Ciric, 1997;Kehrli et al, 1998;Domingues et al, 1999;Yokoyama et al, 2001).…”

Section: Introductionmentioning

confidence: 73%

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Medial portion of the cavernous sinus: Quantitative analysis of the medial wall

et al. 2005

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Pituitary tumors invade the cavernous sinus via the medial wall. Researchers have speculated that this wall is composed of dura and that substances secreted by tumors might damage this barrier. In contrast to the lateral wall, little is known about the structure of the medial wall of the cavernous sinus (MWCS). This study provides the first detailed quantitative (thickness) and qualitative (histological) assessment of the MWCS. Eighteen sellar-parasellar tissue blocks were obtained from adult human autopsies. Ten specimens were used for microsurgical dissection and macroscopic anatomical description. Eight specimens were used for histopathological study and for recording computer measurements of MWCS thickness. Each of these eight specimens was divided into three approximately equal-sized pieces, with cuts made in the coronal plane from posterior to anterior starting at the anterior level of the pituitary stalk. Wall thicknesses were compared in the three different regions (posterior, middle, anterior), and also on the left vs. the right sides. The investigations showed that the MWCS is a distinct dural layer that forms a barrier between the medial venous space of the cavernous sinus and the pituitary gland. The mean thickness of the 48 total (left and right) MWCS observed in the 24 sections examined was 0.195 +/- 0.066 mm (range = 0.080-0.387 mm). This wall is composed of loosely arranged collagen fibers that comprise a specific layer known as "meningeal dura." The posterior third of the MWCS was significantly thinner than the middle third (P = 0.0014) or anterior third (P = 0.0001). No macro- or microscopic defects were observed in any of the MWCS in the 18 specimens. The thinness of the posterior MWCS suggests that this is the most likely path for extension of pituitary tumors into the cavernous sinus.

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Section: Discussionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 73%

Medial portion of the cavernous sinus: Quantitative analysis of the medial wall

et al. 2005

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“…These findings in the adult cadaver are supported by observations on the human embryo and fetus which indicated that the fibrous capsule of the adult pituitary gland has multiple origins. 11,12 CONCLUSION The nature of the medial wall of the cavernous sinus may play a significant role in determining the direction of growth of pituitary adenomas and in planning pituitary surgery. This study indicates that the medial wall of the cavernous sinus consists of both the meningeal dura and weblike loose fibrous network, which are located at the anterosuperior and posteroinferior aspects, respectively.…”

Section: Discussionmentioning

confidence: 99%

Is There an Identifiable Intact Medial Wall of the Cavernous Sinus? Macro- and Microscopic Anatomical Study Using Sheet Plastination

Diao

Liang

et al. 2013

Operative Neurosurgery

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“…In the literature, different results of the anatomic studies have been published about the structure of the CS medial wall. Studies on the structure of the medial wall were reported as one layer by some authors, as two layers in another or thin, loose and histological defects by the other (8,9,14,15,26,28,30). Thus, some authors reported that tumour histology is responsible for CS invasion while some authors insist on histological defects of the medial wall (15,16,25,27,29).…”

Section: Discussionmentioning

confidence: 99%

A new endoscopic surgical classification and invasion criteria for pituitary adenomas involving the cavernous sinus

Ceylan¹,

Anık²,

Koç³

2011

Turkish Neurosurgery

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AIm: There are two major problems for the pituitary adenomas invading the Cavernous Sinus (CS); differentiation of extension and invasion and inability to demonstrate the medial wall via preoperative imaging methods. Two important corridors are defined in endoscopic cavernous sinus approaches; the lateral and medial corridor. mAterIAl and methOds: A retrospective analysis was performed in 400 endoscopic transphenoidal approaches and 360 pituitary adenomas underwent endoscopic transphenoidal surgery in our department between September 1997 and December 2010. 48 patients affected by the tumours involving the cavernous sinus were included in this study. results:We performed an intraoperative evaluation of cavernous sinus invasion considering visualization of the medial wall defect, intracavernous ICA segments, minor tumour extensions through small focal pit holes of the medial wall of CS or confirming carotid segments of CS by micro-doppler. Cavernous sinus involvement was classified into three types according to the medial and lateral corridor extension of the tumor as 25 isolated medial corridor involvement (Type I), 5 isolated lateral corridor involvement (Type II) and 18 total involvement (Type III).COnClusIOn: Our classification depends on fully surgical endoscopic approach supported by neuroimaging techniques and anatomical studies and shows a good predictive value for all cavernous sinus involvement. BulGulAr: Kavernöz sinus invazyonunu intraoperatif olarak medial duvar defektini, intrakavernöz carotid arter segmentlerini, kavernöz sinus medial duvarındaki küçük defektleri görüntüleyerek ya da mikrodopler ile kavernöz sinüsün karotid segmentlerini konfirme ederek sağladık. İnvazyonu tanımladıktan sonra kavernöz sinüse yayılım şeklini tümörün medial ve lateral koridorlardan ilerlemesine göre üç grupta sınıflandırdık.25 hastada izole medial koridor tutulumu (Tip I), 5 hastada lateral koridor tutulumu (Tip II) ve18 hastada da her iki koridor tutulumu saptadık (Tip III).sOnuÇ: Yapmış olduğumuz sınıflandırma anatomik çalışmalarla ve görüntüleme yöntemleriyle desteklenmiş bir endoskopik cerrahi sınıflandırmadır ve sadece yüksek dereceli değil, tüm kavernöz sinus tutulumları için prediktif değer taşımaktadır.

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Anatomical observations of the development of the pituitary capsule

Cited by 26 publications

References 10 publications

Medial portion of the cavernous sinus: Quantitative analysis of the medial wall

Medial portion of the cavernous sinus: Quantitative analysis of the medial wall

Is There an Identifiable Intact Medial Wall of the Cavernous Sinus? Macro- and Microscopic Anatomical Study Using Sheet Plastination

A new endoscopic surgical classification and invasion criteria for pituitary adenomas involving the cavernous sinus

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