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- Published: April 28, 2020
- By: Joel Murphy, MD
The microscopic image shows an H/E stain at high power of tubules displaying proximal tubular injury with epithelial thinning, reactive nuclear change, and intratubular, eosinophilic pigmented casts with a globular to beaded/ropey appearance. When casts with this morphology are found, the next step is to identify if the nature of the cast, including myoglobin and hemoglobin. In this case, the casts stained strongly for myoglobin, which fit clinically as the patient was suffering from rhabdomyolysis secondary to statin use. Aside from drugs, the clinical differential diagnosis for rhabdomyolysis includes physical trauma (i.e. intense exercise, seizure), toxins (i.e. snake venom), inflammatory...