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Videosurgery and Other Miniinvasive Techniques
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vol. 14
Original paper

Modified bedside twist drill craniostomy for evacuation of chronic subdural haematoma

Tomasz Szmuda
Sara Kierońska
Paweł Słoniewski
Jarosław Dzierżanowski

Department of Neurosurgery, Medical University of Gdansk, Gdansk, Poland
Videosurgery Miniinv 2019; 14 (3): 442–450
Online publish date: 2019/02/18
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Chronic subdural haematoma (CSDH) is a frequently occurring disease with an incidence of 1.7 to as high as 13.3 cases per 100 000 [13]. Advanced age (> 70), alcohol abuse, male sex, seizures or anticoagulation therapy markedly increases CSDH occurrence [2, 4, 5]. Some authors have reported that vitamin K antagonists cause a 3-fold increase in the risk of subdural haematoma, compared with antiplatelet therapy and with factor Xa inhibitors [68]. In the recent decade, CSDH has become of concern among elderly patients partially due to their frequent use of anticoagulation therapy.

Chronic subdural haematoma can be treated by three surgical approaches: twist drill craniostomy (TDC), burr hole craniostomy (BHC) or standard craniotomy (SC). Currently there is a lack of evidence, such as prospective randomised trials, demonstrating the superiority of any method in terms of mortality and efficacy [9]. On the other hand, BHC is initially the most commonly preferred treatment approach as revealed by a nationwide British study [9].

Bedside TDC is an attractive alternative to standard therapies such as BHC and SC, although rarely attempted in Eastern Europe [10]. Minimal invasiveness, shorter hospitalisation, no need for general anaesthesia or an operating room are some of the benefits of TDC [1119]. As noted by others, TDC is associated with severe complications including acute intracranial bleeding [6]. In the early 2000s TDC was noted to have a higher rate of recurrence than BHC [1]. On the other hand, recent prospective studies supported either TDC or BHC as a primary treatment method [17, 20]. Despite the typical learning curve and the potential advantages of bedside procedures, there has been a general reluctance of the neurosurgical community to adopt TDC.

The content of CSDH could be compartmentalized by fibrin septa that hinder sufficient drainage of the entire haematoma. In such cases, SC with membranectomy is considered superior to BHC or TDC [21]. Recently, endoscopic BHC was proven safe and more effective in the removal of the membranes with fewer complications such as drainage failures or recurrences. However, endoscopic membranectomy is technically challenging and should be performed by a skilled surgeon [22].


To date, CSDH cases treated with TDC and BHC/SC have not been extensively compared in terms of their clinical and radiological features. Anecdotally, it seems that older patients, those with comorbidities and harbouring non-septated CSDH can be easily treated with TDC. Therefore we aimed to examine whether the surgeons’ decisions to qualify CSDH patients for SC, BHC or TDC were correlated with any patient characteristics or radiological features of the haematoma.

Material and methods

Patients treated at a single institution due to CSDH were retrospectively reviewed the same year the TDC method was introduced there (2017). Ultimately 5 patients underwent TDC and another 27 were treated using BHC or SC. In the TDC group there were 3 males and 2 females; the median age was 69 years (47–84). The BHC or SC group consisted of 20 (74%) males and 7 (26%) females; the median age was 72.2 years (52–91 years).

Pre-operative computed tomography (CT) scans were reviewed and classified according to the following features: (1) density (either isodense or hypodense relative to the parenchyma); (2) presence and thickness of the CSDH’s outer membrane; (3) thickness of the CSDH; (4) midline shift; (5) presence of septated compartments; (6) location of haematoma (uni-/bilateral) and (7) side. A follow-up CT was done within 24 h after surgery. The volume of haematoma was evaluated on both pre- and post-operative CT using RadiAnt DICOM Viewer v. 4.6.5 (Medixant, Poland).

The TDC procedure

All TDC procedures were performed using the Subdural Evacuating Port System (Medtronic, Tulsa, USA) under local anaesthesia (~10 ml of 1% lidocaine) in the neurosurgery department’s small procedures room. Complete and disposable kits included hand drill, fenestrated drain and suturing material. Haematomas were evacuated via a port. The burr hole position was identified anterior to the area of greatest subdural fluid thickness in the preoperative CT. Following a 5 mm linear incision of the skin, subcutaneous tissue, galea and periosteum, a self-retaining scalp retractor was applied to expose the skull. The drill bit was secured with a safety stop collar. A burr hole was made by a twist drill through the outer and inner tables of the skull using a 3 or 5 mm pointed tip drill bit. The modified drilling technique was adopted from Yadav et al. [16]. An angle of 60° to 90° to the outer table of the skull was chosen. Drilling included subdural membranes and was stopped until fluid outflow, then the evacuating port was inserted (silicone tube by Medtronic, Tulsa, USA). A suction reservoir bulb was attached to one end of the tube and a low homogeneous negative pressure was applied. If feasible, the patient was positioned in the 30° Trendelenburg position. An antiseptic ointment was generously applied around the base of the port, followed by placing a sterile dressing. Fluid evacuation was completed within 24–48 h until full fluid evacuation was confirmed in a CT scan. During this period, the suction reservoir bulb was monitored and emptied as needed with repeated reapplication of low negative pressure (Photo 1).

Photo 1

Awake twist drill craniostomy technique. The set including all tools required for entire procedure (A). The patient with bilateral hypodense chronic subdural haematoma (CSDH) was qualified for twist drill craniostomy (TDC) (B). Following local anaesthesia and skin incision a disposable self-retaining scalp retractor was applied (C). Placing the safety stop collar (D) should precede hand burr hole drilling (E). Thereafter the subdural space could be drained using a silicone drain (F). The postoperative computed tomography imaging showed a residual CSDH and moderate pneumocephalus (G)


Independent factors

Factors determining the surgeon’s selection of treatment modality between SC, BCH and TDC were divided into clinical and radiographic features.

The clinical factors included age, sex, clinical status at admission (according to Glasgow Coma Scale – GCS), timing of surgery after trauma, past medical history and concomitant medications. The final clinical outcome at discharge was categorized using the Glasgow Outcome Scale (GOS). Total time of hospital stay was not compared between the TDC and BHC/SC groups, because it is generally influenced by each individual patient’s condition at admission. The baseline radiographic factors were evaluated on CT imaging.

Statistical analysis

Univariate analyses were performed using Pearson’s correlation, Mann-Whitney U test for continuous variables or χ2 test for categorical variables. Binary logistic regression analysis was then used to dichotomize the outcome as a variable dependent on variables which had p > 0.25 in the univariate analysis. The level of statistical significance was set at p < 0.05.



In patients with unilateral CSDH the mean duration of the bedside TDC procedure (27.0 ±37.3 min; min.–max. 24–30 min) was significantly shorter (p < 0.01) than that of the standard methods SC/BHC (86.6 ±34.1 min; min.–max. 43–135 min). However, there were no significant differences (p = 0.27) in the duration of surgery between TDC and the standard approaches for bilateral haematomas (TDC: 46.0 ±1.4 min; min.–max. 45–47 min vs. SC/BHC: 85.5 ±37.5 min; min.–max. 59–112 min). The mean duration of subdural catheter indwelling was 2 days, regardless of the chosen method.


We did not note any major complications such as acute epi- or subdural bleeding. One patient developed intracerebral haematoma during the postoperative period. Non-tension pneumocephalus developed postoperatively in one patient treated with TDC (1 of 5; 20.0%), compared to 4 and 6 patients who were treated with BHC and SC respectively (10 of 27; 37.0%) (p = 0.46). Two patients were re-operated on due to wound infection, one following BHC and another following SC. Two patients suffered postoperative seizures after BHC, another 5 patients after craniotomy, whereas none did after TDC.

Baseline characteristics

The most common presenting symptoms were headache, dizziness, and vomiting, whereas paresis was observed in 40.6% of patients. No significant differences were noted between groups (TDC vs. SC/BHC) in terms of symptoms, comorbidities, anticoagulants, antiplatelet therapy and history of head injury. Sixty percent and 3.7% of patients qualified for respectively TDC and SC/BHC had a history of subdural haematoma (SDH) surgery, although the difference was not significant (p = 0.06) (Table I).

Table I

Baseline clinical characteristics

Baseline clinical characteristicsEntire group (n = 32)TDC (n = 5)Craniotomy/burr hole (n = 27)P-value
Age, mean ± SD; min.–max. [years]68.7 ±13.9;
71.6 ±14.9;
68.1 ±13.7;
Sex: males/females24/83/221/60.58
Glasgow Coma Scale:
 Mean ± SD12.6 ±2.813.6 ±2.612.4 ±2.80.39
 14–1517/32 (53.1%)4/5 (80.0%)13/27 (48.1%)0.34
 9–1313/32 (40.6%)1/5 (20.0%)12/27 (44.4%)0.62
 < 93/32 (9.4%)0/5 (0.0%)3/27 (11.1%)1.00
 Headache18/32 (56.2%)4/5 (80%)14/27 (51.8%)0.35
 Dizziness19/32 (59.4%)2/5 (40.0%)17/27 (63.0%)0.37
 Vomiting18/32 (56.3%)3/5 (60.0%)15/27 (55.6%)1.00
 Paresis13/32 (40.6%)1/5 (20.0%)12/27 (44.4%)0.62
Medical history:
 Any comorbidity28/32 (87.5%)4/5 (80.0%)24/27 (88.9%)0.51
 DM17/32 (53.1%)1/5 (20.0%)16/27 (59.3%)0.16
 Arterial hypertension17/32 (53.1%)1/5 (20.0%)16/27 (59.3%)0.16
 COPD10/32 (31.3%)1/5 (20.0%)9/27 (33.3%)1.00
 Atrial fibrillation22/32 (68.8%)3/5 (60.0%)19/27 (70.4%)0.63
History of SDH surgery3/32 (9.4%)2/5 (40.0%)1/27 (3.7%)0.06
History of head injury20/32 (62.5%)2/5 (40.0%)18/27 (66.7%)0.34
Anticoagulation therapy17/32 (53.1%)3/5 (60.0%)14/27 (51.9%)1.00

[i] COPD – chronic obstructive pulmonary disease, CSDH – chronic subdural haematoma, TDC – twist drill craniostomy.

Radiology – baseline differences and outcome

We found non-clinically significant air accumulation in both hemispheres in all postoperative CTs. The TDC group differed from the SC/BHC group in terms of several baseline radiological characteristics. All 6 patients with septated CSDH were treated with the standard craniotomy, although the difference was not significant (p = 0.55). Patients with thicker haematoma were offered TDC more often (p < 0.01). On the other hand, standard treatment (SC or BHC) was preferred more often in patients with greater midline shift in CT (p = 0.01). Baseline density of haematoma, presence and thickness of CSDH outer membrane, uni-/bilateral haematoma, and side did not influence the surgeon’s preference of TDC vs. standard treatment (Table II and Figure 1).

Table II

Radiological characteristics

Radiological characteristicsEntire group (n = 32)TDC (n = 5)Craniotomy/burr hole (n = 27)P-value
 Hypodense28/32 (87.5%)4/5 (80.0%)24/27 (88.9%)
 Iodense4/32 (12.5%)1/5 (20.0%)3/27 (11.1%)
Outer membrane of CSDH15/32 (46.9%)1/5 (20.0%)14/27 (51.9%)0.34
Thickness of outer membrane
(mean ± SD; min.–max.) [mm]
1.2 ±1.0;
0.9 ±0.9;
1.3 ±1.1;
Thickness of entire CSDH
(mean ± SD; min.–max.) [mm]
16.3 ±6.4;
25.3 ±1.6;
14.6 ±5.4;
< 0.01
Midline shift
(mean ± SD; min.–max.) [mm]:
3.4 ±2.9;
0.5 ±1.0;
4.0 ±2.8;
 > 5 mm14/32 (43.7%)0/5 (0%)14/27 (51.9%)0.04
 < 5 mm18/32 (56.3%)5/5 (100%)13/27 (48.2%)
Septated6/32 (18.8%)0/5 (0%)6/27 (22.2%)0.55
 Bilateral4/32 (12.5%)2/5 (40.0%)2/27 (7.4%)0.11
 Right16/32 (50.0%)2/5 (40.0%)14/27 (51.9%)1.00
 Left12/32 (37.5%)1/5 (20.0%)11/27 (40.7%)0.63

[i] CSDH – chronic subdural haematoma, TDC – twist drill craniostomy.

Figure 1

Significant differences between bedside twist drill craniostomy and standard treatments for chronic subdural haematoma. Time of the procedure for unilateral CSDH was significantly shorter in the case of TDC. Regarding baseline characteristics, patients with thicker haematoma and with smaller midline shift in computed tomography were offered TDC more often

CSDH – chronic subdural haematoma, SC – standard craniotomy, BHC – burr hole craniostomy, TDC – twist drill craniostomy.


Recurrence of haematoma

Two patients harboured a recurrent CSDH following TDC (2 of 5; 40.0%), whereas only 1 did in the SC/BHC group (p = 0.06). In all patients with recurrent CSDH the symptoms relapsed after their discharge. In all patients with a CSDH relapse, the haematoma was evacuated by BHC.

Final clinical outcome

Five patients died, all from the SC group. There was no significant difference between SC/BHC and TDC in terms of mortality (p = 0.29). All five patients in the TDC group had favourable clinical outcome (GCS 14–15), compared to only 17 of 27 (62.9%) from the SC/BHC group. The mean length of stay in the neurosurgery department was 3 days when TDC was performed, whereas it was 9 and 6 days following SC and BHC respectively (p < 0.01).

Multivariate analysis

None of the factors analysed using logistic regression were statistically significant (p > 0.05).


The CSDH is a frequently encountered condition in neurosurgical practice [19]. An ageing population, increasing use of anticoagulants and antiplatelet medication, and greater availability of sophisticated head imaging are some of the factors that increase CSDH occurrence [6, 23]. In the era of the minimally invasive approach to surgery, the development of simple techniques to manage CSDH seems desirable [20]. Currently the drainage of CSDH can be accomplished by SC or two craniostomy methods – BHC or TDC. Craniostomy is a less invasive procedure than SC and is regarded as the gold standard for symptomatic CSDHs. Lack of a clear consensus in the literature regarding the optimum treatment for CSDH gives the surgeons an opportunity to treat according to personal preferences. The TDC is the least invasive therapy for CSDH, although it has several limitations, including the surgeon’s personal opinion about TDC performed outside of the operating room [24, 25]. This study was undertaken to determine the factors influencing the surgeons’ choice – SC, BHC or TDC.

Various efficacy measures have been used in studies assessing the course of CSDH, such as mortality, morbidity, recurrence rate and cure rate. In terms of mortality and morbidity, most of the large meta-analyses provide similar rates [3, 26, 27]. The authors of the above studies do not associate mortality with any therapeutic approach. On the other hand, the recurrence of haematoma is a meaningful outcome. A relapse of haematoma requires additional surgery, generates costs and increases the infection rate. Both techniques, TDC and BHC, have been compared in various studies across several years [11, 17, 18, 24, 28]. In the first meta-analysis, TDC significantly surpassed BHC in terms of recurrence (TDC 18.0% vs. BHC 39.0%) [1]. Three recent meta-analyses demonstrated that recurrence rates are statistically the same for either BHC or TDC (relative risk (RR) = 1) [3, 26, 27]. Moreover, the recurrence rate was similar for TDC and BHC in a prospective study (TDC 18.4% vs. BHC 11.1%) which was not included in the former systematic reviews [11]. After applying sophisticated statistics, one team suggested that BHC is superior to TDC [28]. An observational study describing the largest number of patients so far (n = 233) showed that almost 33% of patients require a re-operation (open surgical evacuation) [12]. Compared to BHC, TDC had a higher operative failure rate (defined by technical factors such as drain obstruction or other surgical complications) (RR = 0.35), although patients achieve higher cure rates (RR = 0.92) [26]. In other words, more patients improved neurologically due to TDC at the end of the follow-up period.

Since both methods had similar effectiveness, the surgeon selected between TDC and BHC according to his or her own preference [18]. The TDC ensures the safety of the patient during the procedure and can be done in the treatment room on the ward under local anaesthesia [15]. These factors represent a huge advantage of this technique. So what are the reasons for the widespread use of BHC (86% of procedures, followed by SC 9%) in Europe? [9, 29, 30]. In Poland almost all patients are offered either BHC or SC. Choosing the best operation for CSDH concerned authors in the past [15, 28]. Every CSDH case differs from another, whereas systematic reviews and meta-analyses lack the individual approach to CSDH. In systematic reviews all previously published cases of CSDH are gathered together and subjected to the statistical analysis. On the other hand, there are several centres in the UK and the USA where TDC with a local anaesthetic is the initial approach, which is cheaper and globally more efficient [12, 14]. We retrospectively evaluated surgeons’ preferences and to our surprise, TDC was chosen in only 5 cases. This may have resulted primarily from issues with billing the procedure, fear of insufficient anaesthesia, reluctance of the team to perform trepanation outside the operating room and last but not least the unwillingness to try a new technique. However, a survey among European neurosurgeons revealed that TDC can be done successfully by junior residents under supervision [30]. Based on our small sample, which nonetheless is the main drawback of the study, we showed that the decision was primarily made according to the radiological features of CSDH. In our study surgeons more eagerly qualified patients with thicker haematomas and with a smaller midline shift for TDC. The above confirms that we selected radiologically ‘simple’ cases for the novel approach. However, surgeons achieved good results in treatment of patients with CSDH when the first choice approach was TDC [12, 14]. The surgical community’s reluctance to adopt novel approaches is particularly noted in urethral robotic surgery, which slowly garners clinical interest [31]. Lack of accessible mentorship and the prolonged/challenging learning curve are known causes of delayed dissemination of new, advanced techniques, despite their clinical validity. Conversely, owing to its simplicity, several undisputed advantages of TDC have been noted. First, general anaesthesia for SC or BHC is associated with some complications, and thus bedside TDC is a good alternative for older patients [14]. Given that the mean age of presentation for a CSDH is in the sixth decade of life, which is directly linked to comorbidities, patients with diabetes or ischaemic heart disease or taking oral anticoagulants are at significant risk of perioperative and postoperative complications [7, 32]. In that group, a less invasive procedure such as TDC seems to be especially advantageous [15, 20]. Our findings do not support the above statement, as the decision upon selection between TDC, BHC or SC has not been based on clinical characteristics but on radiological findings. The second advantage of TDC is the lower cost of the procedure as well as lower costs of subsequent hospitalisation. The costs associated with TDC are lower than in the case of BHC or SC. Traditional methods of the evacuation of haematoma are performed in the operating room, which engages numerous medical staff and generates high costs [10, 25, 32, 33]. The total cost of the surgical procedure and hospitalisation for a patient harbouring CSDH is estimated at approximately EUR 5000 [25]. However, a disposable TDC set includes all the surgical instruments required for the procedure. In Poland, such a disposable TDC set costs only EUR 400. The patient can be discharged home after follow-up CT in 48 h following TDC without the need to stay at a high dependency unit [17, 25, 34].

The TDC has some disadvantages. In emergency situations such as intracranial bleeding, there might not be enough time to reach the operating room and perform a craniotomy. However, the risk of intraprocedural bleeding during TDC is extremely low. The recent analysis of 387 procedures at a single-centre revealed one case of significant TDC-related bleeding (0.25%) [12]. Secondly, there is a risk of incomplete evacuation of the haematoma. The TDC set had a closed-system drainage, though without any irrigation. Nevertheless, a meta-analysis demonstrated that irrigation may lead to better outcomes [27]. Another disadvantage of TDC is certainly the patient’s discomfort during the procedure, although that topic was not alluded whereas a single author disagreed with that opinion [15].

Some surgeons have modified traditional TDC sets or used irrigation [4]. The most interesting are modifications of the drilling angle [13, 16, 25, 35]. The burr hole can be placed in the pre-coronal region in order to easily introduce the drain posteriorly. In our study we successfully applied the method proposed by Yadav et al. [16]. In order not to cause vascular injury, another modification of the classic TDC method was introduced [25]. The optimal entry point for TDC has been proposed: 1 cm anterior to the coronal suture at the level of the superior temporal line [34]. On the other hand, the elevation of the patient’s head during and after TDC was proved to have no impact on the rate of recurrence and complications [36].

The third method of CSDH evacuation is SC. The traditional approach to this type of haematoma is particularly useful in septated haematoma or in recurrences [29]. However, according to recent meta-analyses SC is associated with higher morbidity and higher complication rates than craniostomy (12% vs. 4%) [3, 37]. In our study almost all patients with septated CSDH were approached (4 SC, 1 BHC). As proposed by others, craniotomy should be reserved for cases of one or multiple recurrences or where there is a large clot component [7]. If the preoperative CT scan shows that the haematoma is surrounded by a capsule formed by the maturated membranes, TDC is considered to be inappropriate and such patients require SC with membranectomy [19]. In case of any difficulties during bedside TDC, it is more demanding to convert the procedure to SC. Recently endoscopic-assisted membranectomy via BHC was found superior to SC in terms of morbidity rate, mortality rate, recovery time as well as length of hospital stay [22].


Bedside TDC is a safe and effective alternative to traditional surgical methods of CSDH treatment. By means of TDC the patient avoids the operating room and anaesthetic complications and the hospital avoids the high costs of the entire hospitalization. Unless there is septated haematoma, and if the patient is able to tolerate the bedside procedure, TDC should be the recommended technique. A large liquid haematoma with minimal midline shift is easily accessible by TDC and is recommended. In case of haematoma recurrence, presence of a solid capsule or membranes among CSDH, SC remains the best treatment option.


Tomasz Szmuda and Sara Kierońska contributed to a publication equally (first authorship).

Conflict of interest

The authors declare no conflict of interest.



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