Weinerber et al classified edema of the male genitalia based on the duration of clinical findings. The authors are from the University of Pittsburgh.
Clinical features: genital edema free of pain
Duration of edema: hours to a few weeks
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Clinical Findings
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Possible Cause
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erythema and history of viral infection
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viral orchitis
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erythema with positive patch test
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contact dermatitis
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infant with fever and an extragenital skin
rash
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Kawasaki's disease
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recent peritoneal dialysis
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dialysate fluid
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ventriculo-peritoneal shunt
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VP shunt herniation
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increase in swelling during a Valsalva maneuver
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hernia
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fluid filled cyst by transillumination or ultrasound
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hydrocele
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heart failure or fluid overload
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edema
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palpable purpura on skin
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Henoch-Schonlein purpura
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abdominal pain with elevated amylase and lipase
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pancreatitis
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living in an endemic region with positive blood smear, serology or adult worm on ultrasound
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filariasis
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no definitive cause identified
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idiopathic (consider AISE, below)
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Additional diagnoses to consider:
(1) ascites
