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As more patients are receiving anticoagulant therapy, spontaneous muscle haemorrhage (SMH) has become a common, potentially life-threatening complication.1 2 However, no standardised approach for SMH has established and intermittent SMH is challenging to manage because of lack of reports.
A 77-year-old man with a history of double mechanical heart valve replacement and chronic atrial fibrillation on warfarin complained of sudden onset of painful swelling in the left leg. Contrast-enhanced computed tomography (CT) revealed femoral and crural muscle haemorrhage (figure 1A) despite a moderate intensity of anticoagulation (Prothrombin time-international normalised ratio 2.01). Following blood transfusion for progressive anaemia, urgent angiography including selective angiography demonstrated no evidence of active bleeding. On the following day, he again experienced sudden worsening of painful swelling in the left leg and anaemia, with haemoglobin dropping from 9.8 to 7.0 mg/dL. Since contrast-enhanced CT revealed enlargement of the muscle haematoma with active bleeding (figure 1B), we repeated angiography. Selective angiography still demonstrated no evidence of contrast agent extravasation (figure 2A, B, Supplementary videos A, B). Thus, we made a diagnosis of intermittent SMH probably because of the tamponade effect of the haematoma. Considering the risk of anticoagulation suspension, warfarin was maintained, and further treatment beyond conservative management was needed to prevent recurrent bleeding and progression of the haematoma that can potentially cause disseminated intravascular coagulation. Given this patient’s haemodynamic stability,3 we attempted empiric embolisation of the arterial branches supplying the haematoma based on CT findings. We embolised an absorbable gelatin sponge through a microcatheter into those branches although permanent embolisation with coil or N-butyl-2-cyanoacrylate is a good alternative.2 Completion angiography revealed the occlusion of those branches (figure 2C, D). Three weeks after the procedure, the patient was uneventfully discharged with evidence of haematoma resolution (figure 1C).
An awareness of intermittent SMH and empirical embolisation, defined as endovascular occlusion of arteries without visible contrast extravasation on digital subtraction angiography, might contribute to improve patient care. Contrast-enhanced CT might be a good tool to perform effective embolisation.
Contributors KS and OK were involved in the clinical management of the patient. KS drafted and OK and SY revised the manuscript.
Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Guardian consent obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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