An 8-year-old gelding was evaluated for intermittent dorsal displacement of the soft palate (DDSP) at exercise. Standing laterolateral radiographs demonstrated an abnormal crossed appearance of the stylohyoid bones. Computed tomography (CT) confirmed abnormal positioning of the left stylohyoid bone and articulations with both the left thyrohyoid and ceratohyoid bones. Surgical treatment consisted of combined left ceratohyoidectomy and thyrohyoidectomy. Postoperatively the patient's presenting complaint resolved completely, with the horse returning to full work. Standing laterolateral radiographs should be obtained prior to laryngeal or hyoid surgery to rule out hyoid anomalies, which could result in surgical failure or subsequent hyoid fracture.
Both lesions possess very similar radiological and histological features and are therefore hard to distinguish from each other (Bryant et al., 2012). Radiographically these cysts appear as expansile and osteolytic lesions contained by a thin 'ballooned' bone layer with an internal 'soap-bubble' appearance. The margin frequently represents expanded periosteum, whereas its characteristic compartmentalised centre is the resultant of numerous small internal septa (Craig et al., 2016). Those not associated with a joint can be as-
Abstract. We present the zeros of the derivatives, ζ (k) (σ + it), of the Riemann zeta function for k ≤ 28 with −10 < σ < 1 2 and −10 < t < 10. Our computations show an interesting behavior of the zeros of ζ (k) , namely they seem to lie on curves which are extensions of certain chains of zeros of ζ (k) that were observed on the right half plane.
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