Long-term follow-up and pregnancy after complete sacrectomy with lumbopelvic reconstruction: case report and literature review

Background Sacrectomy remains a technically complex procedure for resection of malignant pelvic neoplasia. Commonly, postoperative complications include permanent neurological deficits. Only a few studies have reported the long-term functional outcomes of patients who had undergone sacrectomy. Case presentation We previously reported on the utilization of complete sacrectomy and lumbopelvic reconstruction for the management of primary myofibroblastic sarcoma of the sacrum and ilium in a 15-year-old female patient. In this report, we update her postoperative course with an additional 5 years of follow-up and Health-Related Quality of Life (HRQoL) outcomes. During this time period, she gave birth to two healthy full-term babies. Conclusion To the best of our knowledge, this is the first report of pregnancy after total sacrectomy and lumbopelvic reconstruction. We outline some of the challenges in the obstetrical management of this patient.


Background
The risk of neurological morbidity following sacrectomy is high. Several reports have documented such long-term outcomes in patients who had undergone sacrectomy for primary sacral tumors [1][2][3][4][5][6][7][8]. In pediatric patients, however, long-term outcomes after sacrectomy for sacral tumors are rarely elucidated in the published literature.
We previously had published our 1-year experience with a 15-year-old female patient who had undergone a complete sacrectomy with lumbopelvic reconstruction for a low-grade myofibroblastic sarcoma of the sacrum. Now, 5 years after surgery, we update our previous report. Most remarkably, the patient has had two successful pregnancies resulting in the birth of two babies at term without perinatal complications. To our knowledge, pregnancy after sacrectomy has not been previously reported in the literature.

History and physical examination
Our patient was a 20-year-old woman with a history of a sacral mass diagnosed by CT-guided needle biopsy 7 years before as benign fibrohistiocytoma. A repeat biopsy of her lesion through an open approach revealed myofibroblastic sarcoma. Consideration was given for reduction of tumor burden and lumbopelvic reconstruction to facilitate long-term progression-free survival and to improve quality of life, respectively.

Operation for complete sacrectomy and lumbopelvic reconstruction
The extension of tumor into both sacroiliac joints prohibited sparing S1; thus, a two-staged total sacrectomy was planned, as previously described. Briefly, the first stage of the procedure included a midline laparotomy, mobilization of the visceral and neural structures, and ligation of the internal iliac vessels. A colostomy was performed, and a right vertical rectus abdominus myocutaneous flap based on the inferior epigastric vessels was mobilized, wrapped in a bowel bag, and placed in the pelvis. The second stage was performed the next day, and it included L5 and S1 laminectomies, bilateral osteotomies and disarticulation of the sacrum from the ilium at the sacroiliac joints, ligation of the thecal sac inferior to the takeoff of the L5 nerve roots, complete L5-S1 discectomy, and transection of the S1-S5 nerve roots. The entire sacrum, along with the tumor, was removed piecemeal. This was followed by lumbopelvic reconstruction with spinal instrumentation and bone graft.

Postoperative course
The patient underwent a long inpatient postoperative course. She responded well to intensive physical rehabilitation. Her postoperative course was complicated by the development of a small superficial soft tissue Staphylococcus epidermidis abscess in the operative bed treated with percutaneous drainage and a full course of intravenous and oral antibiotics. The patient also developed a small ischial decubitus ulcer, remote from the surgical incision, treated with local wound care. At 3 months after surgery, the patient was able to ambulate with the assistance of a walker. She had normal strength in her left leg, except for plantarflexion (S1). Her right leg was more impaired, with normal proximal strength but significant weakness in hip extension (L4 and L5), dorsiflexion (L4), extensor hallucis longus (L5), and plantarflexion (S1), suggesting sciatic nerve injury. She was discharged home and was pain-free off narcotics.
At 5 years after surgery, the patient remains pain-free. She was able to ambulate independently with a right ankle-foot orthosis. There was no evidence of locally progressive or metastatic disease on follow-up imaging. Postoperative imaging showed settling and a stable fibrous pseudoarthrosis ( Fig. 1a and b).

Pregnancies
The patient's first pregnancy was unbeknownst to us during a period of follow-up loss after sacrectomy. However, she gave birth to a healthy 5-lb, 2-oz baby girl through a cesarean delivery at 37 weeks' gestation by a community obstetrician. There were no birth complications. The baby, now 3½ years old, is meeting developmental milestones.
The Baylor Maternal-Fetal Medicine Service at Texas Children's Pavilion for Women followed her second pregnancy closely. Frequent visits every 2 to 3 weeks were scheduled to monitor maternal status (e.g., weight gain and blood pressure). The pregnancy was carefully documented with monthly fetal ultrasound and MRI (Figs. 2a, b, and 3). At each outpatient visit, catheterization was performed to send urine culture, and the patient was on Keflex suppression throughout the pregnancy. Routine prenatal labs were obtained, and routine vaccines were administered. A repeat elective cesarean was performed at 37 weeks of gestation. Great care was taken to identify the right inferior epigastric vessels, the pedicle of the rectus abdominis musculocutaneous flap used for closure of the sacral defect (Figs. 4 and 5). Plastic surgery was available at the time of delivery, but the right rectus abdominis muscle flap was not seen and was assumed to be posterior to the uterus. A healthy baby girl was delivered (Fig. 6). The birth weight was recorded as 6 lb and 9 oz. Apgar scores of 8 and 9 were assigned at 1 and 5 min, respectively. Table 1 summarizes the patient history in timeline format.

HRQoL outcomes
Prior to the patient's second pregnancy, we collected standardized and validated indices data to quantitate   Our patient's ODI score was 30 %, representing mild disability.
SF-36 Physical Component Summary for our patient was calculated as 28.6 (national average, 53.5), and SF-36 Mental Component Summary was 52.9 (national average, 46.19). Our patient's scores compared favorably in the domains of social functioning and mental health but were below the population norms across the remaining scales of physical functioning.

Total sacrectomy
The treatment of primary sacral tumors represents a challenge because of their anatomical location and often large size at presentation. Instability at the lumbopelvic junction frequently accounts for the majority of the symptoms, such as axial back pain, that these patients, like ours, experience. Reconstruction of the lumbopelvic junction succeeds in stabilizing the spine from a biomechanical standpoint, which improves patient functionality. There have been no other reports archiving pregnancy after sacrectomy.

Genitourinary
Pyelonephritis and urinary tract infections are associated with higher risk of spontaneous prematurity. Because of the increased risk and severity of urinary tract infections, more frequent assessment for asymptomatic bacteriuria and antibiotic suppressive therapy has been suggested for pregnant women with neurogenic bladders.

Cutaneous
Pressure ulcer prevalence is significant throughout the lifetime of a person with impaired mobility. Pregnancy can be a risk factor for this complication due to further decreased mobility, development of dependent edema at the lower extremities, weight gain, and nutritional deficiencies. Prevention remains the cornerstone. Pregnancy-specific preventive recommendations include more frequent changes in body position, reassessment of equipment (wheelchair, cushion, and orthosis), and greater attention to limiting weight gain during pregnancy.

Pulmonary
Pregnancy presents multiple potential risk factors for thromboembolism that may act synergistically with neurological injury resulting in paraparesis. They include greater immobility, preeclampsia, sepsis, and cesarean delivery. Although we discussed risk for venous thromboembolism (VTE) due to decreased mobility, we did not take additional measures, such as prophylactic low-molecular-weight heparin, and simply encouraged ambulation. In general, however, thromboprophylaxis is indicated for cesareans in women with neurological deficits.

Musculoskeletal
A number of changes associated with pregnancy may result in a loss of independence. Worsening spasticity of abdominal or adductor muscles-in addition to weight gain and carpal tunnel syndrome frequently occurring during pregnancy, even in women without neurological

Cesarean section versus vaginal delivery
Neurological deficit is not an absolute indication for cesarean delivery. Nonetheless, the rate of cesareans among women with neurological dysfunction is higher than expected in the general obstetric population. Our patient had a prior cesarean delivery, declined a trial of labor after cesarean, and elected for repeat cesarean section. Vaginal delivery could have been an option, but the concern was that in case of an emergency cesarean delivery, there could be surgical risks due to the extensive surgery that she had had before.

Consultation with plastic surgery
A vertical rectus abdominis myocutaneous flap has one of the smallest incidences of necrosis of any of the myocutaneous flaps associated with pelvic reconstructive surgery. The physiologic key is that an open wound has been covered with a myocutaneous flap that offers an excellent covering for a wound with an excellent blood supply, i.e. the inferior epigastric artery, a branch of the external iliac artery. Extreme care should be taken to ensure the integrity of the inferior epigastric vessels as they branch off the external iliac vessels. When the neurovascular bundle of the inferior epigastric artery has been interrupted, the flap likely will not survive. Thus, it would be wise to involve a plastic surgeon in the planning of a cesarean section incision.

Effects on pregnancy outcomes
Women with neurological impairment may be insensate to the onset of labor. Instructions on techniques of selfuterine palpation to detect contractions at home and serial assessment of cervical length with ultrasonography and home uterine activity monitoring may constitute additional measures to prevent unexpected spontaneous prematurity or undiagnosed labor.
Postpartum depression has been reported to be higher in women with neurological deficits than in the general pregnant population. Correlates of depression include higher stress level, greater social isolation and lower satisfaction with social network, less mobility, unemployment, abuse, and poorer overall health.

Summary
We treated a 15-year-old female patient who underwent a total sacrectomy for gross total resection (GTR) of a sacral myofibroblastic sarcoma with extension into the iliac wings and, herein, have described long-term (5-year) functional follow-up. Pregnancy after sacrectomy has not been previously reported in the literature. During the follow-up period, our patient carried two babies to term and delivered via cesarean with no perinatal complications. Obstetric challenges and considerations for our patient with neurological deficits in lower extremity, impaired mobility, and bladder and bowel dysfunction include the following: prophylaxis for urinary tract infections, DVT prevention, precautions against pressure ulcers, maintenance of functional independence, and preservation of the blood supply (i.e., the inferior epigastric artery) to the myocutaneous flap used during the pelvic reconstruction when planning a cesarean. Long-term progression-free survival with satisfactory HRQoL outcomes seems to have been attained.

Consent statement
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review.

Competing interests
The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper. The authors have no competing financial interests related to this case report.