Computed Tomography-Guided Virtual Stereotactic Puncture and Catheter Drainage for a Brainstem Pontine Hemorrhage: A Case Report

Background: Patients with severe hypertensive brainstem hemorrhages have poor prognoses if they only receive conservative medical management. In contrast, aggressive operative interventions may decrease the morbidity and mortality in such patients. These operative treatments include craniotomy for evacuation of the hematoma, stereotactic positioning, and neuronavigational-guided hemorrhage puncture and drainage. Here, we report a novel and relatively simple procedure to achieve satisfactory outcomes in a patient with a brainstem pontine hemorrhage. Case Presentation: A 53-year-old man who was diagnosed with brainstem pontine hemorrhage. On hospital day 6, he underwent CT-guided, virtual stereotactic puncture and catheter drainage of this brainstem pontine hemorrhage. Medical treatments were continued after this procedure. On postoperative day 16 (hospital day 22), the patient was discharged from the hospital, awake and able to answer questions appropriately. Muscle strengths were grades V and IV for the left and right extremities, respectively. The patient was continued with active rehabilitation and achieved a Barthel index of 85 points at one month after the percutaneous drainage procedure. Conclusion: CT-guided, virtual stereotactic percutaneous transcranial puncture and catheter drainage for brainstem pontine hemorrhages has obvious potential advantages and offers a possible alternative to achieve the best outcomes with minimal operative trauma compared to open microcraniotomy.


Background
Patients with severe hypertensive brainstem hemorrhages have poor prognoses if they only receive conservative medical management. In contrast, aggressive operative interventions may decrease the morbidity and mortality in such patients. These operative treatments include craniotomy for evacuation of the hematoma, stereotactic positioning, and neuronavigational-guided hemorrhage puncture and drainage. Here, we report a novel and relatively simple procedure to achieve satisfactory outcomes in a patient with a brainstem pontine hemorrhage.

Case Presentation
A 55-year-old male was admitted to our hospital on September 29, 2019, due to the sudden onset of a coma of 2 h duration. He had a history of hypertension but was non-compliant with taking his medication for this condition. The patient had no reported prior history of neurosurgical intervention. The admission evaluation documented a comatose man with a Glasgow Coma Scale (GCS) score of E1TV3. The patient's pupils were unresponsive to light and had diameters of 1 mm and 2 mm for the right and left eyes, respectively. His vital signs were as follows: heart rate of 110 beats/min, blood pressure of 175/100 mmHg, respiratory rate of 16 breaths/min, and a temperature of 38.5˚C. He withdrew his left but not right extremity to pain stimulation. A pathologic Babinski sign was induced bilaterally. Computed tomography (CT) on the day of admission showed a brainstem pontine hemorrhage (Figure 1(a)). He was treated with mechanical ventilation, conservative medical management.
On hospital day 6, the patient was still in a coma with a persistent GCS score of E1TV3. He still required mechanical ventilation. Muscle strength tests revealed horizontal movements to the left extremity and slight flexion to the right extremity with pain stimulations. On the same day, a CT was repeated and showed a brainstem pontine hemorrhage (Figure 1(b)), for which he underwent CT-guided, virtual stereotactic puncture and catheter drainage of this brainstem pontine hemorrhage.

Surgical Procedure
The baseline of the brain CT scan was from the supraorbital ridge to 2 cm below the external occipital protuberance. The middle level of the pontine hemorrhage was selected as the horizontal positioning plane (Figure 1(c)). The central location of the brainstem hemorrhage is labeled as point B in the CT images. The proximal skin puncture site was inferior and posterior to the occipital mastoid; the pathway of puncture was aimed at the center point of brainstem hemorrhage and was designated as point A on the CT images. The distal site was lateral to the supraorbital ridge in the contralateral temporal area and is designated as point C and could be adjusted by the site labeled as "MARK" (Figure 1(d)). Point A and point B were marked on the head. The distances between the points were meas-ured and labeled as AB, DA, and EC. Based on stereotactic theory, horizontal and vertical lines for punctures (horizontal and vertical planes) were marked on the skin with respect to the above-mentioned puncture lines. The depth of puncture (distance of AB) was then calculated. According to the horizontal and vertical planes, a drainage catheter with a diameter of 3 mm was inserted along the puncture path into the hemorrhage. Approximately 3 mL of blood was obtained using a slight negative-suction pressure. Extraventricular drainage was also applied simultaneously. A postoperative head CT showed a substantial decrease in the size of the pontine hemorrhage, with a satisfactory positioning of the drainage catheter (Figure 2(a), Figure 2(b)).
Medical treatments were continued after this procedure. The drainage catheter was removed on postoperative day 2 when there is no bloody fluid flowing out. Repeat CT images on postoperative days 6 and 14 (hospital days 12 and 20) are shown in Figure 2(c), Figure 2(d). On postoperative day 16 (hospital day 22), the patient was discharged from the hospital, awake and able to answer questions appropriately. Muscle strengths were grades V and IV for the left and right extremities, respectively. The patient was continued with active rehabilitation and achieved a Barthel index of 85 points at one month after the percutaneous drainage procedure.

Discussion
Intracranial hemorrhage is a serious but common disorder.  In summary, minimally invasive, stereotactically directed percutaneous, transcranial puncture and drainage appears to be a promising approach to treating localized hypertensive brainstem hemorrhages. Before using this approach, however, brainstem cavernous hemangiomas, hemorrhage secondary to a tumor, and aneurysmal hemorrhages should be excluded preoperatively. The proximal skin puncture site that is inferior and posterior to the occipital mastoid should avoid the transverse sinus to maximize the safety of the approach.

Conclusion
CT-guided, virtual stereotactic percutaneous transcranial puncture and catheter drainage for brainstem pontine hemorrhages has obvious potential advantages and offers a possible alternative to achieve the best outcomes with minimal operative trauma compared to open microcraniotomy. In addition, this procedure does not require any special equipment, which can facilitate its wide adoption in many primary hospitals. This procedure is suitable for patients with severe localized hypertensive brainstem hemorrhages and offers novel potential advance for managing patients with hypertensive brainstem hemorrhages.