基底動脈的變異其實很少見，而發育不全更是罕見。一37女性，因雙側耳鳴2年求診於本院，理學檢查、聽力檢查、腦波圖、心電圖及血液學檢查均為正常，血管磁振造影呈現基底動脈與右側椎動脈發育不全。本個案基底動脈發育不全與雙側耳鳴關係實未明，可能是進行性的動脈硬化影響到發育不全的基底動脈，進而影響其小動脈分支之供血，雖未傷害到內耳耳蝸或聽神經，卻已傷害到橋腦內的聽覺神經路徑造成耳鳴，建議給予抗血小板劑與腦循環促進劑保守治療，設法降低基底動脈的血管阻力。3個月後，病症緩解，追蹤迄今已半年，情況依然穩定。
Anomaly of basilar artery is rare, and basilar artery hypoplasia (BAH) is even rarer. A 37-year-old female who had bilateral tinnitus for two years visited hospital. Although physical examination, audiometry, electronystagmogram, electrocardiogram, and blood examinations were normal, magnetic resonance angiogram revealed BAH and right vertebral artery hypoplasia. An unknown association had been observed between BAH and bilateral tinnitus in our case. It is possible that arteriosclerosis gradually influenced her BAH and its arteriolar branches. Although the inner-ear cochlea or auditory nerve was spared, the auditory pathway in pons was injured. Therefore, antiplatelet and brain circulation promoter were conservatively recommended to reduce the vascular resistance of posterior circulation. Three months later, tinnitus subsided. Furthermore, it was uneventful in the following half a year.
