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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