Objective To explore influences of improved intramuscular injection on quality of benzathine benzylpenicillin medication.Methods The cluster random sampling was adopted to select 178 patients who needed injection of 240U benzathine benzylpenicillin.A self-control study design was used,and benzathine benzylpenicillin was injected in both sides with each of 1 200 000 units.The left side was injected via routine method,while the right side was injected by an improved intramuscular injection.One-time success rate,degree and duration of pain during and after injection were recorded.Results The differences of one-time success rate,pain during injection,pain after injection,duration of pain after injection and incidence of induration after injection between two groups were statistically significant(P＜0.01).Conclusion The improved intramuscular injection can improve one-time success rate of benzathine benzylpenicillin,reduce pain during injection and local pain after injection,shorten duration of pain and decrease incidence of induration after injection.

Objective To analyze the X-ray,CT and MRI findings of chordoma in the cervical vertebrae,so as to improve its diagnostic accu-racy.Methods X-ray,CT and MRI findings of 7 cases of chordoma proved pathologically were analyzed retrospectively.X-ray and CT were undergone in all 7 cases,MRI in 3 cases.Results X-ray demonstrated bony destruction in 7 cases,bony collapse in 1 case. Narrowing of inter-vertebral space was in 6 cases and soft tissue mass was in 3 cases.CT demonstrated bony destruction in 7 cases, calcification within the tumors in 2 cases,involvement of the accessory of the cervical vertebra and transverse foramen in 5 cases. Soft tissue mass was around the cervical vertebra in 4 cases.MRI was undergone in 3 cases.On T1 WI middle signal in 3 cases were showed,on T2 WI low and high mixed signal in 3 cases,and soft tissue masses around the lesion in 3 cases.Conclusion Chordoma of the cervical vertebrae is uncommon.Full understanding X-ray,CT,MRI characteristics is useful to improve the diagnosis,guide clinical surgery treatment and forecast prognosis.