Analysis Of Imageology On The Primary Orbital Tumor And Study Of Color Doppler Flowing Imaging On Ocular Tumor

Analysis of imageology on primary orbital tumor and study of Color Doppler Flowing Imaging on ocular tumorAbstractPurpose The fist part of this paper is to determine characteristic of primary orbital tumor(POT) on ultrasonography,computer tomography and magnetic resonance imaging and to analyze the difference of surgical.Methods Three hundred and twenty eyes of 310 patients(during the period from 1992 to 2001 at the Changzheng hospital)suffering from POT are retrospectively analyzed.Clinical manifestitions, medical imagelogical features and operation methods are measured. All data are collected with Microsoft Access and analyzed by SPSS software.Result Among 310 cases hemangioma accounts for 98 cases,neurogenic tumor 44 cases,lacrimal duct tumor 34 cases, lymphoma 32 cases,inflammatory psedotumor 24 cases, dermoid cyst 14 cases,mucocele 45 cases and bone tumor 12 cases.Location:intracone 132 cases,extracone 52 cases,subperiosteum interspace 20 cases,lacrimal gland and lacrimal sac 34 cases and nasal sinus 45 cases.All suffered eyes were examed with ultrasonography,255 eyes with CT and 148 eyes with MRI. Tumors of 279 eyes were extirpated.Conclusion (1)MRI,CT and US have distinguished difference in diagnosis of cavernous hemangioma,and US has the highest detective rate.If combined with three methods,misdiagnosis rate may be significantly decreased;there is no relation between tension and protuberence of the concerned eye.(2)On lymphoma three methods have a low diagnosis rate;in order to acquire higher diagnosis rate,pathological and immunological examinations should be considered.(3)On neurogenic tumor,lacrimal duct and nasal sinus tumor,CT has a higher diagnosis rate.On neurotubules tumor,MRI takes advantage over CT and US.Ultrasonography as the most convenient method in diagnosising POT is considered as regular tool. When the lesion extends deep and destroy orbital bone or adjacent tumor invades orbital cavity,CT should be further considered.If liposarcoma,dermoid cyst,neurotubule tumor or intracranial invasion is suspected,MRI should be highly considered. Further investigation shows that there is a distinguish difference between lateral orbitotomyand medial orbitotomy in excision of POT,especially locating at deep orbital cavity.Purpose The second part of this paper to analyze the usefulness of color Doppler flow imaging in the differentiation of benign and malignant ocular tumorsï¼›to study the CDFI characteristic of ocular and orbital tumors and to seek out some further practical diagnostic criteria. Methods Blood flow in tumor and the central retinal artery, the posterior cliliary arteries, the ophthalmic artery and the central retinal vein was assessed by CDFI in 55 patients. Blood velocity measurements in orbital vessels in these patients were compared with the same measurements on contralateral eyes.Diagnosis was confirmed during surgery or by biopsy. Result Different tumors have different echograms and characteristic bloods.(1) There are significant difference between malignant and benign lesions in peak systolic velocity(P=0.00003),peak diastolic velocity(P=0.0002)resistent index (P=0.035),PSVOA(P=0.005) and OARI(P=0.005)The Resistent index(RI)of malignant tumor is high (RI>0.70),but benign is low (mean RI<0.70).(2)The highest blood supply in malignant tumor is MALT lymphoma and melanoma of choroids;lipoasrcoma has low blood supply. The highest blood supply in benign tumor is meningioma and neurofibroma; mucocele, OCH and dermoid cyst have the lowest blood supply. Conclusion Comparison of blood flow in all patients has shown that there is statistically significant difference between blood supply of malignant lesion and that of benign lesion. Blood supply of the troubled eye and controlled eye has sorts of states.CDFI may help to provide a more precise preoperative histological diagnosis noninvasively.