Splenic epidermoid cyst
Incidental finding at upper abdominal ultrasound. No history of trauma.
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Cystic mass (through transmission) with internal debris that was quite mobile during prolonged scanning much like a hydrocoele (as evidenced by internal "color" on the duplex scanning).
These cysts are developmental and rare. Diagnosis is by exclusion (i.e. no history of trauma or pancreatitis). Internal echoes on ultrasound are consistent with the material found in such cysts at pathological examination.