Filar lipomas are a subtype of spinal lipomas wherein adipose tissue accumulation is restricted to the filum terminale. Embryologically, filar lipomas are considered to occur because of the failure of secondary neurulation, although the precise mechanism is not yet completely understood. Involvement of ectopic mesodermal, ectodermal, and endodermal tissues in spinal lipomas has been occasionally reported, and the origin of these ectopic tissues has been supposed to be migration of pluripotent tissues, which exist during secondary neurulation. We report an infantile case of capillary hemangioma involved in filar lipoma. To our knowledge, this is the first report of a case of intradural extramedullary capillary hemangioma at the filum terminale. We suspected that the filar lesion arose during the late phase of secondary neurulation based on the clinical, anatomical, and histological characteristics. .
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