最終診断：Splenic lymphangioma
　　　　　(cavernous type)

pathologyにて腫瘤は多房性の嚢胞性病変で，内容液は漿液で血液の混入は認めず，
Lymphangiomaと診断された．

Splenic lymphangioma
■Lymphangiomas commonly encountered in neck and axillary region, but rarely occur in the abdominal viscera.
■Splenic lymphangiomas may be solitary or multiple (lymphangiomatosis).
■Pathology: capillary, cavernous and cystic, depending on the size of the vascular channels.
■Gross pathology shows a unilocular or multilocular cystic mass.

Imaging features of lymphangioma
■CT: sharply margined, thin-walled, single or multiple areas of low attenuation, which are usually subcapsular.
No enhancement on post-contrast images.
Small, linear, peripheral calcification may be present.
■MRI: lymphangiomas resemble cysts: homogeneously low intensity on T1WI, high intensity on T2WI. Areas of high intensity on T1WI may result from large amounts of protainaceous fluid in internal hemorrhage.

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