123I-IMP SPECT陽性の転移性毛様体腫瘍の1例

A case of metastatic tumor of ciliary body with positive finding by 123I-IMP single photon emission CT

要約　目的：¹²³I-IMP single photon emission CT（IMP SPECT）が陽性の転移性毛様体腫瘍1症例の報告。症例：両親に悪性リンパ腫があり，黄斑円孔手術の既往がある46歳女性が右眼視力低下で受診した。所見と経過：矯正視力は右0.1，左1.5であり，右眼の毛様体と脈絡膜に白色腫瘤があった。IMP SPECTで右眼に¹²³Iが集積したが，過去の脈絡膜悪性黒色腫3例でのIMP SPECTよりも集積の程度はやや低かった。初診から6週後に全網膜剝離になったため眼球を摘出し，肺腺癌の転移であることが確定した。結論：IMP SPECTは悪性黒色腫の診断に有用であるが，転移性腺癌でもこれが陽性のことがある。

Abstract.　Purpose：To report a case of carcinoma metastatic to the ciliary body with positive finding by ¹²³I-IMP single photon emission CT（IMP SPECT）. Case：A 46-year-old female presented with impaired visual acuity in her right eye. Her parents had had malaignant lymphoma. Findings and Clinical Course：Her corrected visual acuity was 0.1 right and 1.5 left. The right eye showed a white tumor in the ciliary body and choroid. IMP SPECT showed positive uptake in the right eye. The amount of uptake was less than that in 3 cases of malignant choroidal melanoma in the past. The eye had to be enucleated after total retinal detachment developed 6 weeks after her initial visit. The eye was diagnosed with adenocarcinoma metastatic from the lung. Conclusion：IMP SPECT is claimed to be positive in malignant melanoma. It may also be positive in metastatic adenocarcinoma to the eye.