Unfused spinous process
Citation, DOI & article data
This should be differentiated from accessory ossicles of the spinous process, which appear after non-fusion of the secondary ossification center (or centers in bifid spinous processes). These appear as a well-corticated fragment adjacent to the tip of the spinous process with a vertical or near-vertical lucency.
The importance lies in patients with potentially traumatic spinal injuries, in which it is important to identify this variant and avoid potential pitfall of diagnosing a fracture. A well-defined cortical margin is a helpful clue.
- 1. Keats TE, Anderson MW. Atlas of Normal Roentgen Variants That May Simulate Disease. Saunders. (2012) ISBN:0323073557. Read it at Google Books - Find it at Amazon
- 2. Mellado JM, Larrosa R, Martín J et-al. MDCT of variations and anomalies of the neural arch and its processes: part 1-pedicles, pars interarticularis, laminae, and spinous process. AJR Am J Roentgenol. 2011;197 (1): W104-13. doi:10.2214/AJR.10.5803 - Pubmed citation
- 3. Buttler P. Applied radiological anatomy. Cambridge University Press. (1999) ISBN:0521481104. Read it at Google Books - Find it at Amazon