Avoid common mistakes on your manuscript.
Diagnosis
Complete fissure of the manubrium sterni.
Discussion
First developing from a pair of longitudinal mesenchymal condensations in utero, the right and left sternal bars meet along the midline and fuse to form a single cartilaginous rod. Fusion commences at the manubrium and proceeds caudad [1]. Incomplete fusion of lower sternebrae results in well-known bony defects variously named sternal foramen, cleft or fissure [2].
Although clefts and foramina are commonly found in the corpus sterni, description of manubrial fissure or foramen had been sparse [3–5] before the study by Yekeler et al., who reported a manubrial cleft in the sterna of six of 1,000 adults [2]. In all of the six patients the cleft was confined to the superior portion of the bone, associated with a sclerotic band just inferior to it in five of them. To our knowledge, a complete manubrial cleft is extremely rare, with only two cases having been reported in the non-English literature [3, 4]. In one of the two cases, reported in 1979, Botsch et al. used conventional tomography to diagnose complete fissure of the manubrium [4], which showed slightly jagged and sclerotic medial margins of the right and left hemimanubria and an inverted-Y shape, almost identical to that in our patient, formed by the interhemimanubrial and hemimanubriosternal joints (Fig. 1b and c in the case presentation).
It is difficult to postulate the developmental origin of a manubrial fissure. However, we suppose that there might be two possible mechanisms: first, on rare occasions, the cephalo-most part of the sternal bar might have been left unfused in utero. Second, there might have been some muscular dynamics facilitating horizontal segmentation of the manubrium at a later stage, similar to diversified movements of the forelimbs facilitating longitudinal segmentation of the sternum [6].
Now that thin-section CT scanning of the bony thorax is becoming routine in clinical practice, we believe that more cases of this condition will be found in the future.
References
Stark P. Midline sternal foramen: CT demonstration. J Comput Assist Tomogr. 1985;9:489–90.
Yekeler E, Tunaci M, Tunaci A, Dursun M, Acunas G. Frequency of sternal variations and anomalies evaluated by MDCT. AJR Am J Roentgenol. 2006;186:956–60.
Saris A, Quinard J, Mauduit A, Zumbiehl J. Congenital fissure of the manubrium sterni. J Radiol Electrol Med Nucl. 1964;45:276–7.
Botsch H, Schmidt L. Unusual shape of a fissure of the sternal manubrium. Rofo Fortschr Geb Rontgenstr Neuen BildgebVerfahr. 1979;131:563–4.
Moore MK, Stewart JH, McCormick WF. Anomalies of the human chest plate area: radiographic findings in a large autopsy population. Am J Forensic Med Pathol. 1988;9:348–54.
Ogden JA, Conlogue GJ, Bronson ML, Jensen PS. Radiology of postnatal skeletal development. Skeletal Radiol. 1979;4:189–95.
Author information
Authors and Affiliations
Corresponding author
Additional information
The case presentation can be found at doi: 10.1007/s00256-009-0755-1.
Rights and permissions
About this article
Cite this article
Han, D.H., Ahn, M.I., Jung, J.I. et al. An asymptomatic young woman with abnormal manubrium sterni: diagnosis and discussion. Skeletal Radiol 38, 1027 (2009). https://doi.org/10.1007/s00256-009-0753-3
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00256-009-0753-3