Abstract
Recent reports have suggested that recurrent tumors can be differentiated from posttreatment fibrosis by use of T2weighted MR imaging [1 -5]. Fibrosis has been shown to have low signal intensity on such images [1-5] and to be distinguishable statistically from recurrent tumor on this basis [4, 5]. Fibrosis in patients 1 year or more after therapy, in particular, has been well differentiated from recurrent tumor [5]. However, not all authors have reported such good results [6], and it appears that other abnormalities such as inflammation and necrosis can produce changes on MR images that are indistinguishable from recurrent tumor [3, 5, 6]. The metabolic information provided by 31P MR spectroscopy seems potentially useful in differentiation of recurrent tumor from nonneoplastic entities. We report a case that exemplifies this possibility.
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