To the Editor: We report the case of a 19-year-old female veterinary student who presented with a 2-week history of a rapidly growing mass on the lateral side of the deltoid area of her left arm. On examination, the mass was soft, freely movable, slightly warm and non-tender. There was no regional lymphadenopathy. The patient was afebrile, with no signs of systemic illness. Ultrasound showed a 3.2 × 2.3 × 1 cm, low-echogenic, lobulated lesion in the subcutaneous fat, with surrounding increased echogenicity suggestive of inflammation. Magnetic resonance imaging showed a poorly defined lesion throughout the deep and superficial fascia, with infiltration into the underlying deltoid muscle (Box 1). A provisional diagnosis of sarcoma was made, but an ultrasound-guided core biopsy sample showed non-necrotising epithelioid granulomas (Box 2).
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