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CASE REPORT
Year : 2012  |  Volume : 29  |  Issue : 1  |  Page : 73-75  

Bifid sternum


1 Department of Respiratory Medicine, Medical College, Kolkata, India
2 Department of Respiratory Medicine, IPGMER, Kolkata, India
3 Department of Respiratory Medicine, North Bengal Medical College, Darjeeling, India
4 Department of Paediatrics, Calcutta National Medical College, Kolkata, West Bengal, India

Date of Web Publication28-Jan-2012

Correspondence Address:
Sibes Kumar Das
Department of Respiratory Medicine, Medical College, Kolkata, West Bengal
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-2113.92370

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   Abstract 

A bifid sternum is a rare congenital anomaly generally diagnosed as asymptomatic at birth. It is sometimes associated with other congenital anomalies. The sternal defects are best corrected surgically during the neonatal period within the first month of life. Sometimes the defect may be diagnosed only in adult life. We here report a case of bifid sternum which was diagnosed incidentally in a 23-year-old male.

Keywords: Bifid sternum, congenital anomaly, humans


How to cite this article:
Das SK, Jana PK, Bairagya TD, Ghoshal B. Bifid sternum. Lung India 2012;29:73-5

How to cite this URL:
Das SK, Jana PK, Bairagya TD, Ghoshal B. Bifid sternum. Lung India [serial online] 2012 [cited 2019 Sep 21];29:73-5. Available from: http://www.lungindia.com/text.asp?2012/29/1/73/92370


   Introduction Top


Sternal cleft is the separation of the sternum with orthotopic normal heart and normal skin coverage. The anomaly appears to represent an isolated developmental defect of multifactorial etiology. The defect is extremely rare and the exact incidence of this anomaly is difficult to reach but it occurred in 0.15% of all chest deformities seen in an institution during a 25-year period. [1] Bifid sternum is generally observed at birth and is asymptomatic. However, patients with this defect may present late in childhood or even in adult life. We herein report a case of bifid sternum because of its rarity and presentation in adulthood.


   Case Report Top


A 23-year-old male presented with a bony defect in the central upper part of his chest wall which had been present since birth. On interrogation it was revealed that he was a full-term baby at birth, with a birth weight of 2500 g and was delivered by a spontaneous uneventful vaginal delivery at 39 weeks of gestation. On examination there was a wide gap in the upper part of the sternum, more evident during inspiration [Figure 1]. Pulsation of great vessels was easily seen through the defect which was covered by a thin layer of skin. No obvious abnormality was noted in any other system. Laboratory investigations were within normal limits. Chest X-ray postero-anterior view revealed a wide gap between the medial ends of the clavicle, and absence of manubrium and upper part of the sternum. Computed tomography scan of the thorax confirmed the defect showing the incomplete superior cleft of the sternum in a U shape [Figure 2]. Echocardiography showed normal pericardium and normal cardiac anatomy. Ultrasonography of the abdomen was normal. Cardiothoracic surgeon was consulted, who opined for surgical repair of the defect. However, the patient refused to undergo surgery and was lost to follow-up.
Figure 1: Wide gap in the upper part of the sternum covered with skin

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Figure 2: 3D reconstruction of CT thorax showing U-shaped gap of the sternum

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   Discussion Top


Sternal bands form in the sixth week of intrauterine life from the lateral plate mesoderm, and the fusion of these separate bands on either side of the anterior chest wall occurs in the ninth week in a craniocaudal direction. [2] The manubrium arises from the mesenchymal promordiums between the ventral ends of the developing clavicles. The manubrial ossification centers on each side of the mid-sternum are fused at birth and fusion of ossification centers in the sternal body is completed by the sixth year. Failure of fusion of the sternal body results in congenital sternal clefts. Sternal clefts are generally observed at birth without symptoms, and are more common in females. [1],[3] The clefts can be divided into complete and incomplete varieties, the latter being more common. [4] Incomplete clefts can be further classified into superior and inferior. The superior sternal cleft may be V-shaped when the cleft reaches the xiphoid process, or U-shaped, with a bony bridge joining the two edges ending at the third or fourth costal cartilages, [5] as seen in our case. Inferior defects are extremely rare, and often occur as a part of Cantrell's pentalogy which consists of bifid sternum, omphalocele, deficiency of anterior diaphragm, defects in diaphragmatic pericardium and congenital heart disease like ventricular septal defect or left ventricular diverticulum. [6] As fusion of the sternum occurs craniocaudally, it is expected that the failure of fusion of the upper part would result in cleft of the whole sternum; the cause of the more common occurrence of the superior defect with normal fusion of the lower part is obscure. [7]

Although often occuring as an isolated defect, sternal cleft may be associated with different congenital anomalies like midline abdominal raphe, ventral hernias, partial or total ectopia cordis, patent ductus arteriosus, absent pericardium, cervicofacial hemangioma, diastasis recti, etc. [2],[6],[7],[8],[9],[10],[11],[12]

The diagnosis of sternal cleft is easily done by inspection and palpation. Diagnostic investigations are directed to exclude associated anomalies. Prenatal diagnosis is difficult but has been reported with the help of ultrasonography. [13]

Repair of the defect is necessary to restore bony protection to the mediastinal structures, to provide normal intrathoracic pressure relationships and to eliminate paradoxical movement of the thoracic viscera, and the large visible contour deformity. [9] Age of the patient is an important factor in determining the technique of surgical correction. [9],[10] The optimal choice of treatment is primary direct closure in the neonatal period when flexibility of the chest wall is maximal and compression of the underlying structure is minimal. [1-3, 5, 8] If the patient presents later in life, reconstruction surgery is required because a simple approximation is impossible because of increasing rigidity of the chest wall and difficulty in accommodating the heart and lungs within the circumference of chest. [10] Various techniques have been used for the reconstruction of the chest wall. One of the earliest successful techniques was sliding costal cartilage technique by Sabiston. [11]

Subsequently, either prosthetic material like Marlex mesh,Teflon mesh, silicon elastomer, and acrylic plate, or autogenous tissues like parietal skull, costal cartilage, pectoralis major muscles have been used for the repair of the cleft. [5],[6],[14],[15],[16] However, it is always advocated to prefer the autogenous tissue over the prosthetic materials, considering the risk of infection and inability of the prosthetic inert materials to grow with the growth of the patient. [16],[17]

 
   References Top

1.Acastello E, Majluf R, Garrido P, Barbosa LM, Peredo A. Sternal cleft: A surgical opportunity. J Pediatr Surg 2003;38:178-83   Back to cited text no. 1
    
2.Bernhardt LC, Meyer T, Young WP. Bifid sternum: Case report and surgical management. J Thorac Cardiovasc Surg 1968;55:758-60.  Back to cited text no. 2
[PUBMED]    
3.Heron D, Lyonnet S, Iserin L, Munnich A, Padovani JP. Sternal cleft: Case report and review of a series of nine patients. Am J Med Genet 1995;59:154-6.  Back to cited text no. 3
    
4.Samarrai AA, Charmockly HA, Attra AA. Complete cleft sternum: Classification and surgical repair. Int Surg 1985;70:71-3.  Back to cited text no. 4
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5.Domini M, Cupaioli M, Rossi F, Fakhro A, Aqunio A , Chiesa PL. Bifid Sternum: Neonatal surgical treatment. Ann Thorac Surg 2000;69:267-9.  Back to cited text no. 5
    
6.Cantrell JR, Haller JA, Ravitch MM. A syndrome of congenital defects involving abdominal wall, sternum, diaphragm,pericardium and heart. Surg Gynecol Obstet 1958;107:602-14.  Back to cited text no. 6
[PUBMED]    
7.Murray JA. Bifid sternum. Br J Radiol 1966;39:320.  Back to cited text no. 7
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8.Shamberger RC, Welch KJ. Sternal defects. Pediater Surg Int 1990;5:156-64.  Back to cited text no. 8
    
9.Aytac A, Saylam A. Successful surgical repair of congenital total cleft sternum with partial ectopia cordis. Thorax 1976;31:466-9.  Back to cited text no. 9
[PUBMED]  [FULLTEXT]  
10.Ishikawa N, Hiranuma C, Sato H, Ueno Y, Seki M, Yamamoto M. Congenital strenal cleft with patent ductus arteriosus: Report of a case. Surg Today 2002;32:66-8.  Back to cited text no. 10
[PUBMED]    
11.Sabiston DC. The surgical management of congenital bifid sternum with partial ectopia cordis. J Thorac Surg 1958;35:118-22.  Back to cited text no. 11
    
12.Kohli V, Nooreyazdan S, Das BN, Kaul S, Singh J, Parmar V. Surgical reconstruction for absence of sternum and pericardium in a newborn. Indian J Pediatr 2006;73:367-70.  Back to cited text no. 12
[PUBMED]    
13.Izquierdo MT, Bahamonde A, Domene J. Prenatal diagnosis of a complete cleft sternum with 3-Dimensional sonography. J Ultrasound Med 2009;28:379-83.  Back to cited text no. 13
[PUBMED]    
14.Hoffman E. Surgical correction of bifid sternum using marlex mesh. Arch Surg 1965;90:76-80.  Back to cited text no. 14
[PUBMED]  [FULLTEXT]  
15.Krontiris A, Tsironis A. Bifid sternum: Successful repair by use of an acrylic plaque:Report of a case. J Int Coll Surg 1964;41:301-7.   Back to cited text no. 15
[PUBMED]    
16.Suri KR, Sharma KR, Jha NK, Sharma BK. Complete congenital sternal cleft in an adult: Repair by autogenous tissues. Ann Thorac Surg 1996;62:573-5.  Back to cited text no. 16
    
17.Knox L, Tuggle D, Knott-Craig J. Repair of congenital sternal clefts in adolescence and infancy. J Pediatr Surg 1994;29:1513-6.  Back to cited text no. 17
    


    Figures

  [Figure 1], [Figure 2]



 

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