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Special Feature | June 2001

Radiological Case of the Month FREE

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Arch Pediatr Adolesc Med. 2001;155(6):732. doi:10.1001/archpedi.155.6.731.

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DENOUEMENT AND DISCUSSION: INCA BONE

DENOUEMENT AND DISCUSSION: INCA BONE | REFERENCES | AUTHOR INFORMATION

Figure 1. Anterior-posterior skull radiograph.

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Grahic Jump Location

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Figure 2. Lateral skull radiograph.

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Grahic Jump Location

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Inca bones are a result of faulty ossification in the interparietal area of the occipital squama.¹ The occipital squama consists of a supraoccipital area that develops in cartilaginous bone and an interparietal area that is ossified in membranous bone. Inca bones form when an additional pair of ossification centers develop in the interparietal area and do not fuse with the remainder of the occipital bone. They are located at the lower border of the interparietal occipital suture and slightly above the external occipital protuberance. The Inca bones fuse completely by age 40 years.¹

The distinction between the Inca bone and a skull fracture is accomplished by noticing the irregular contour of the edges of the Inca bone compared with the smoother, linear course of a skull fracture.² The distinction is important in avoiding the patient and the family experiencing an evaluation for nonaccidental trauma.

REFERENCES

DENOUEMENT AND DISCUSSION: INCA BONE | REFERENCES | AUTHOR INFORMATION

Matsumura GUchiumi TKida KIchikawa RKodama G Developmental studies on the interparietal part of the human occipital squama. J Anat. 1993;182 ((Pt 2)) 197- 204

Keats TE Atlas of Normal Roentgen Variants. 4th ed. Chicago, Ill Year Book Medical Publishers1973;65- 67

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DENOUEMENT AND DISCUSSION: INCA BONE | REFERENCES | AUTHOR INFORMATION

Accepted for publication September 22, 1999.

Reprints: Kimberly Parente, MD, Medical College of Georgia, 1120 15th St, Augusta, GA, 30912-3770.

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Grahic Jump Location

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Grahic Jump Location

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Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

References

Matsumura GUchiumi TKida KIchikawa RKodama G Developmental studies on the interparietal part of the human occipital squama. J Anat. 1993;182 ((Pt 2)) 197- 204

Keats TE Atlas of Normal Roentgen Variants. 4th ed. Chicago, Ill Year Book Medical Publishers1973;65- 67

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Radiological Case of the Month. Arch Pediatr Adolesc Med. 2001;155(6):732. doi:10.1001/archpedi.155.6.731.

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Radiological Case of the Month FREE

DENOUEMENT AND DISCUSSION: INCA BONE

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