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Limited dorsal myeloschisis associated with intramedullary infantile hemangioma in the conus medullaris: illustrative case.
J Neurosurg Case Lessons 2023 April 25
BACKGROUND: Limited dorsal myeloschisis (LDM) and intramedullary infantile hemangioma rarely coexist in the spinal cord.
OBSERVATIONS: The authors describe the case of a 3-month-old girl who, despite lacking neurological symptoms or signs, had a cigarette burn-like mark at the lumbosacral area and skin dimpling in the gluteal area. Magnetic resonance imaging showed a low-set conus due to a thickened filum and an abnormal subcutaneous stalk connected to the conus medullaris. In combination with the skin lesions, these findings strongly implied nonsaccular-type LDM. An intramedullary mass in the conus medullaris was also shown on magnetic resonance imaging and was homogenously enhanced with isointensity on T1- and T2-weighted images. We prophylactically untethered the spinal cord and partially removed the intramedullary mass, which had no clear borders, for a safe surgical dissection. Histologically, the intramedullary mass was an infantile hemangioma, and the subcutaneous stalk was a lesion associated with LDM. The patient remained neurologically intact after surgery, and then 2 years later, there was spontaneous regression of the residual tumor.
LESSONS: Although rare, nonsaccular type LDM may appear concurrently with intramedullary infantile hemangioma at the conus medullaris. The authors present a possible mechanism behind this concurrent presentation in the same area.
OBSERVATIONS: The authors describe the case of a 3-month-old girl who, despite lacking neurological symptoms or signs, had a cigarette burn-like mark at the lumbosacral area and skin dimpling in the gluteal area. Magnetic resonance imaging showed a low-set conus due to a thickened filum and an abnormal subcutaneous stalk connected to the conus medullaris. In combination with the skin lesions, these findings strongly implied nonsaccular-type LDM. An intramedullary mass in the conus medullaris was also shown on magnetic resonance imaging and was homogenously enhanced with isointensity on T1- and T2-weighted images. We prophylactically untethered the spinal cord and partially removed the intramedullary mass, which had no clear borders, for a safe surgical dissection. Histologically, the intramedullary mass was an infantile hemangioma, and the subcutaneous stalk was a lesion associated with LDM. The patient remained neurologically intact after surgery, and then 2 years later, there was spontaneous regression of the residual tumor.
LESSONS: Although rare, nonsaccular type LDM may appear concurrently with intramedullary infantile hemangioma at the conus medullaris. The authors present a possible mechanism behind this concurrent presentation in the same area.
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