颅内黑色素瘤的CT和MRI表现

CT and MRI manifestations of intracranial melanomas

目的 探讨颅内黑色素瘤的CT和MR影像特点。方法 回顾性分析 1993年以来收治的 5例颅内黑色素瘤的CT和MR影像特点。结果 原发性黑色素瘤 2例 ,转移性黑色素瘤 3例。全部病例均行CT检查 ,表现为类圆形高密度影 4例、类圆形低密度影 1例 ;4例行MR检查 ,呈短T1、短T2 者 3例 ,稍长T1、短T2 者 1例。结论 MRI有助于颅内黑色素瘤的诊断 ,在一定程度上可以区分原发性和转移性黑色素瘤。

Objective To explore the CT and MR imaging characteristics of intracranial melanomas. Methods CT and MRI characteristics in five patients admitted to our hospital from June 1993 to June 2000 and diagnosed as intracranial melanomas were retrospectively analyzed. Results There were two cases of primary melanoma and three cases of secondary melanoma. All the cases were examined by CT. The lesions presented as high density in 4 cases, and low density in only 1 case. Four cases were examined by MRI. Short T 1 and short T 2 signals were found in 3 cases, and slightly long T 1 and short T 2 signal was found in 1 case. Conclusion There are some special characteristics of melanomas on the MR imaging, which are helpful to ensure the diagnosis and distinguish the primary melanomas from secondary melanomas.