Acute calcific tendinitis of the longus colli is an unusual cause of acute neck pain and stiffness. Acute calcific tendinitis is a relatively benign inflammatory condition that can clinically mimic more serious entities such as retropharyngeal abscess, spondylodiscitis, or spine trauma.

Agrawal A, Kalyanpur A. Acute Calcific Tendinitis of the Longus Colli. Hong Kong Journal of Radiology 2013. 2013 June.

Reference: http://www.hkjr.org/