Prevalence of muscle injury following intra-arterial chemotherapy.
OBJECTIVE
Intra-arterial chemotherapy (IAC) is frequently used as an adjuvant treatment for musculoskeletal tumors. Past studies have noted that IAC not only induces favorable effects in tumor, but may also cause muscle edema and necrosis in previously normal tissue, reflected as increased signal on T2-weighted scans. In order to evaluate the prevalence of these effects, we reviewed all patients receiving IAC and MRI at our institution.


METHODS
Our study population consisted of 24 patients who underwent IAC. All subjects were studied with MRI both pre- and post-IAC. None of the subjects in this study underwent surgery or radiation therapy until after the post-IAC MRI examination. Any muscle group involved by the tumor or peritumoral edema on the initial scan was excluded from the study. Catheter position during IAC was recorded as central or peripheral. Scans were scored positive if muscle groups in regions remote from the tumor site demonstrated increased T2 signal following IAC.


RESULTS
Six out of these 24 patients (25%) were found to have positive results. A significant association was found between peripheral catheter position and a positive scan post-IAC (Fisher's exact test, P = 0.024).


CONCLUSIONS
Because of our exclusion criteria, we are convinced that the finding of increased T2 signal in 25% of our patients was caused by IAC and represents muscle edema or necrosis. Knowledge of this post-chemotherapy MR finding should help prevent confusion during the interpretation of follow-up MR examinations.
Kuno
R C
RC
University of Washington School of Medicine, Department of Radiology, Seattle 98195-7115, USA.
Richardson
M L
ML
Zink-Brody
G C
GC
Coldwell
D M
DM
D000328:Adult; D000368:Aged; D000970:Antineoplastic Agents / Q000008:administration & dosage*; D001859:Bone Neoplasms / Q000188:drug therapy; D002404:Catheterization / Q000009:adverse effects; D004487:Edema / Q000209:etiology; D005260:Female; D006801:Humans; D007261:Infusions, Intra-Arterial / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000188:drug therapy; D018482:Muscle, Skeletal / Q000293:injuries* / Q000473:pathology*; D009336:Necrosis
D000970:Antineoplastic Agents