The Imaging Study Of Orbital Sectional Anatomy And Leukocoria

Objective:Clear CT and MRI display ability of orbital normal structure, clarify distribution regularities of the orbital anatomy structure, provide sectional anatomical imaging of orbit for imaging diagnosis, which guide clinical diagnosis and treatment for orbital disease.Methods:In this study, we selected thirty volunteers no eye injury inflammation,postoperative. fifteen volunteers were examined with CT and injected contrast agent, do a routine axial scan and reconstruct Coronal and sagittal oblique for it. Another fifteen volunteers were examined with MR and injected contrast agent, MRI scan axial, coronal, sagittal oblique, conventional T1WI,T2WI,FST2WI,Scanning level should parallel to the optic nerve when we reconstruct and scan. Observe each structure different levels of anatomy in orbital CT and MRI imaging.Results:Axial HRCT can clear display orbital internal wall,external wall,superior orbital fissure,inferior orbital fissure,optic canal structure and their communications .Superior opthalmic vein,optic nerve and extraocular muscles can be clearly displayed, but it can′t display orbital nerve and ophthalmic artery. some ophthalmic artery can be displayed with contrast agent .MRI can′t very well display orbital bone ,but it can display optic nerve,opthalmic vein,extraocular muscles. superior orbital fissure and inferior orbital fissure′s nerve can be displayed. subarachnoid space around optic nerve display very well in FST2WI. Coronal CT can better display, superior orbital fissure,inferior orbital fissure and optic canal. ophthalmic artery and eye vein can't display without contrast agent,their distribution and branch show well with contrast agent.In coronal,Medium signal extraocular muscles located around orbital cavity, optic nerve in the center, nervous frontalis,oculomotor nerve and nasociliary nerve can be showed in orbital coronal, but MRI indistinguish them。In sagittal ,CT and MRI can fully display the optic nerve full-length,ophthalmic artery below it,ophthalmic vein above it. Each structure shows clearly in the eyeball.Conclusion:orbital CT,MRI can clear display each anatomical structure and orbital space position, They offered information can better show each anatomy structure for imaging diagnosis,differential diagnosis and ophthalmology,neurosurgery providing good anatomical references. Objective:Explore CT and MRI diagnostic value for leukocoria , provides imaging diagnosis and differential diagnosis for it,thus guide clinical doctors better choice imaging examination method,which will help leukocoria clinical diagnosis and treatment.Methods:87 patients with leukocoria wered retrospective analyzed between January 2000—February 2011 in jilin university second hospital. By histopathological or Clinical comprehensive diagnosis as the criterion, divided it into RB group,PHPV group,Coats group and ROP group, Their imaging findings wered comprehensive analyzed, search for differential leukocoria imaging performance,characteristic diagnostic standard and idiosyncrasy of check method.Results:RB group:we can see difform soft tissue masses in vitreous body all patients. different shapes calcification can be seen in thirty-six cases, CTpositive rate is 94.7% (36/38),MRI positive rate is 73.7% (22/30),two cases small eye ball, three cases large eye ball.PHPV group: 32 patients are all small eyeball, Along cloquet tube's abnormal density or signal shadow in vitreous body, like the cable form,tape,fills shape. Mass mild-to-moderate wered strengthen. Positive findings of CT for diagnosing PHPV were 61.5% (8/13), MRI were 93.8% (30/32).Coats group: All children eye size are normal, wall of eyeball of 2 cases thick, Retinal detachment have 9 cases, CT results conform with Clinical comprehensive diagnosis five cases,MRI six cases.ROP group: six patients are low birth weight for premature, Bilateral eyeball are small, Retinal detachment five patients, CT results conform with Clinical comprehensive diagnosis two cases,MRI four cases.Conclusion:The soft tissue mass with calcification in vitreous body, soft tissue weredstrengthened, which is RB relatively characteristic performance. CT has high specificity on diagnosis of the RB,MRI has important reference value to RBstaging. Microphthalmia, abnormal density or signal along Cloquet in vitreous are PHPV characteristic imaging findings。Men,older children,Monocular, CT and MRI showed retinal detachment has important reference value for coats diagnosis. Clear clinical history ( Low birth weight premature,High-concentration oxygen),bilateral incidence, eyeball different degree narrowing and retinal detachment are the important basis of ROP diagnosis.