The authors report two cases of rare localization of intra muscular my
xoma: one in the buttock, and the other in the lumbar area. The first
case, a 58 years old woman had a four month history of a mass in the b
uttock. Computed tomography revealed the presence of a solid tumor, Di
agnosis was based on histological examination, After surgical treatmen
t no recurrence was observed after fourteen months, The second case wa
s a 54 years old woman who presented a sciatica with back pain and neu
rological signs. The symptoms didn't response to medical treatment. Co
mputed tomography showed an enlarged and cystic lumbar lesion extendin
g to the first sacral hole, with bone erosion of L3 and L4 articular a
pophysis and spinous process. Needle biopsy and surgical excision of t
he tumor were performed. Total neurological recovery was observed and
no recurrence was observed after three years, The authors reminded the
caracteristics of this rare and benign soft tissue tumor and specifie
d the place of magnetic resonance imaging (MRI) to establish the diagn
osis which was still confirmed by histological examination of an open
biopsy. Clinical follow-up revealed exeptionnal recurrence and no meta
stasis.