Granuloma annulare is a benign idiopathic inflammatory disorder of the dermis, characterized by formation of dermal papules in young children.
Clinical presentation
Granuloma annulare most commonly seen in kids between 2-12 years old and usually it occurs in extremities. One typical location is pretibial when the lesion is subcutaneous. It has various clinical presentations:
-
cutaneous forms
perforating
generalized
subcutaneous form: presenting as a soft tissue mass
Radiographic features
Plain radiograph
These have very little value. The only manifestation is non-specific increased density in the subcutaneous compartment without involvement of bone involvement or mineralization.
Ultrasound
Ill-defined solid mass that is hypoechoic relative to adjacent fat. This can exclude a vascular or cystic lesion.
MRI
T1: ill-defined subcutaneous mass, isointense to muscle
T2: slightly hypointense signal intensity compared with fat, but may also show heterogeneous hyperintense signal
T1 C+: diffuse enhancement can be seen
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