Institution: Cornell University
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Diagnosis: Plant foreign body with metal screw as the nidus
This is difficult to explain on the basis of thje electromotive charge on the dissimilar materials involved as is the usual explanation with stones and metals.
The concentric lamination of tan material is made up of the hulls of oats in the feed. Some mineral is layered in the concretion as thin white layers and several dark layers are fecal material itself. Why a metal screw is the nucleus is probably related to its physical properties and not to its electromagnetic property as in mineral calculi.
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Uploaded on: 2018-04-24