Organo-phosphate induced delayed neuropathy: report of two cases.

nal intensity on T1-weighted images and variable signal ranging from hypo to hyperintensity on T2-weighted images. The fat content is seen strongly hyperintense on T1-weighted imaging while the other contents appear hypointense. On T2weighted sequences, the fat component demonstrates hypointensity similar to subcutaneous fat. A thin rim of calcification is frequently present. Additionally, curvilinear hypointense elements may be seen if the lesion contains hair. The mixed composition of the tumor gives it a characteristic non-homogenous appearance. A giant thrombosed aneurysm was considered preoperatively due to the unusual location and the lamellar pattern of the lesion simulating a clot in different stages of organization.