PMC5921447_01
(A) MRI findings of intraneural lipoma spreading the median nerve fibers. (B) MRI findings of the arteriovenous malformation, a contrast-enhanced mass located at the base of the third and fourth metacarpal base region
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F1
MRI revealed an 8x27x29-mm contrast-free soft-tissue formation in the midpalmar space and another 6x8-mm lesion in the third and fourth metacarpal base region, which was contrast enhanced [Figure 1].
Arteriovenous malformation marked with blue arrow
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F2
A 0.8x1.2-cm vascular mass was identified proximal to the third and fourth metacarpal base region just above the carpal tunnel causing compression to the tunnel [Figure 2].
Intraneural lipoma marked with blue arrow
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F3
An encapsulated mass was found to originate distal to the division of the nerve, spreading the fibers of the median nerve [Figure 3].
Histopathological view of intraneural lipoma
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F4
Histological examination revealed the midpalmar mass as a lipomatous tumor composed of mature adipocytes without intermingling nerve fibers and the vascular mass was diagnosed as an arteriovenous malformation [Figures 4 and 5].
Histopathological view of arteriovenous malformation
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F5
Histological examination revealed the midpalmar mass as a lipomatous tumor composed of mature adipocytes without intermingling nerve fibers and the vascular mass was diagnosed as an arteriovenous malformation [Figures 4 and 5].