A renal subcapsular hematoma may occur in a person engaged in exercise or sport. It may go unrecognized if imaging studies are not performed.
Risk factors associated with triggering hemorrhage:
(1) contact sport with blow to a kidney
(2) accident or fall
(3) use of an exercise machine (vibrating back massage, twister machine)
(4) other vigorous movements
Risk factors associated with tendency to bleed:
(1) renal tumor
(2) renovascular malformation
(3) hereditary or acquired bleeding disorder, including anticoagulation
Clinical features:
(1) back pain, typically renal colic
(2) hemodynamic instability if large
Imaging findings:
(1) blood density on CT or MRI in renal subcapsular location
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Specialty: Surgery, orthopedic, Nephrology
