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Solitary bone cysts are benign, fluid-filled cavities that most often
occur in childhood. Several minimally invasive decompression methods have
been proposed; however, performing a surgical procedure through the thinned
overlying cortex raises the risk of pathological fracture and neurovascular
damage, especially in lesions located in the bone diaphysis. We describe a new
technique that circumvents these problems: tunneling through the normal cortex
and medullary space with a flexible reamer, placing a retrograde medullary
nail for cyst decompression.
Malignant triton tumor (MTT) is a rare variant of malignant peripheral nerve sheath tumor (MPNST) with rhabdomyosarcomatous differentiation. We report the case of a 54-year-old male without a history of neurofibromatosis type 1 (NF1) who had a growing abdominal wall tumor diagnosed as MTT. Computed tomography (CT), magnetic resonance imaging (MRI) and 2-[F-18]-fluoro-2-deoxy-D-glucose positron emission tomography/CT (FDG-PET/CT) were performed. The MRI and FDG-PET/CT indicated that the lateral component of the tumor was composed of many proliferative cells, corresponding to the histopathological finding of a cellular proliferation of spindle-shaped cells. In light of this case and previous reports, it is apparent that FDG-PET/CT is a helpful tool for distinguishing MTT from benign peripheral nerve sheath tumor.