Most dacryocystorhinostomy (DCR) procedures succeed, with reported success rates ranging from about 80% to over 97% depending on the technique used, but the minority of cases that develop complications often share a recognizable pattern of warning signs in the days, weeks, and months after surgery. Knowing what to watch for matters because early recognition of a problem almost always leads to a better outcome than waiting until symptoms become entrenched. The complications themselves range from common annoyances like granulation tissue and mild bleeding to rare but serious events such as cerebrospinal fluid leak.
What Counts as a Failed DCR
Before you can recognize a complication, it helps to understand how surgeons define failure in the first place. The standard criteria used in clinical studies are straightforward: surgery is considered a failure if tearing does not improve, if the lacrimal system cannot be flushed (irrigated) in the office after surgery, or if nasal endoscopy shows scarring over the new opening or no dye passing through it.1PubMed. External versus endoscopic dacryocystorhinostomy for acquired nasolacrimal duct obstruction in a tertiary referral center Some patients fall into a gray zone where the passage is technically open but tearing persists, a distinction surgeons call “anatomical success versus functional success.” A patient who still tears despite a patent ostium may have a pump-mechanism problem rather than a structural one.
Bleeding After Surgery
Some bloody nasal discharge in the first day or two is expected. The complication surgeons worry about is delayed bleeding, sometimes called secondary hemorrhage, which typically shows up between days four and ten after surgery. One study of over 400 external DCR procedures found delayed epistaxis (nosebleeds) in about 3.4% of cases, with affected patients averaging 70 years of age compared to 62 in those without bleeding.2JAMA Otolaryngology–Head & Neck Surgery. Delayed Epistaxis in External Dacryocystorhinostomy: Rate and Risk Factors A separate series found secondary hemorrhage after about 3.4% of procedures as well, with six of ten affected patients requiring hospitalization for nasal packing and intravenous antibiotics, though none needed a blood transfusion.3PubMed. Secondary haemorrhage after dacryocystorhinostomy
What makes the risk factors somewhat counterintuitive is that high blood pressure does not appear to raise the odds of delayed bleeding. Instead, the strongest associations are with older age and having had a lacrimal sac infection before surgery.2JAMA Otolaryngology–Head & Neck Surgery. Delayed Epistaxis in External Dacryocystorhinostomy: Rate and Risk Factors Patients with underlying platelet dysfunction are at higher risk; in one series of 150 consecutive cases, the only two patients who needed treatment for postoperative hemorrhage both had endogenous platelet problems.4PubMed. Hemorrhage associated with dacryocystorhinostomy and the adjunctive use of desmopressin in selected patients Interestingly, patients who had stopped aspirin or similar anti-inflammatory drugs before surgery did not bleed more than those who had never taken them.
If you notice bright red blood dripping from the nose or pooling in the throat several days after DCR, and especially if the bleeding does not stop with gentle pressure, that warrants urgent contact with your surgical team. Most delayed bleeds resolve with nasal packing, but they occasionally need more aggressive management.
Wound Infection and Cellulitis
Infection around the surgical site is uncommon when appropriate antibiotics are used, but it can look alarming. The hallmarks are marked tenderness along the incision (in external DCR) or around the inner corner of the eye, swelling, redness, and sometimes pus from the wound. A prospective study comparing three infection-prevention methods found that without adequate antibiotic coverage the cellulitis rate climbed to 18%, while groups receiving perioperative antibiotics saw rates under 2%.5PubMed. Prevention of cellulitis after open lacrimal surgery: a prospective study of three methods The takeaway for patients is that prescribed postoperative antibiotics and nasal rinses are not optional extras. Skipping them substantially raises the infection risk.
Cellulitis that develops despite prophylactic antibiotics can sometimes signal a retained foreign body, resistant organisms, or an unrecognized lacrimal sac abscess. Warmth, increasing redness that spreads outward from the wound, and fever are red flags that justify same-day evaluation.
Scarring and Ostium Closure
The most common reason a DCR eventually fails is that the surgically created opening (the ostium) scars shut. This can happen weeks to months after surgery and is the single biggest threat to long-term success. Histopathological examination of scarred ostia from failed DCRs shows dense, deeply stained collagen with active fibroblasts and sometimes new bone forming within the scar tissue itself.6Ophthalmic Plastic & Reconstructive Surgery. Histopathology, Immunohistochemistry, and Electron Microscopic features of a Dacryocystorhinostomy Ostium Cicatrix In other words, the body does not just lay down scar tissue; it can actually regenerate bone across the opening, which explains why some closures feel almost as solid as the original obstruction.
Patients notice ostium closure as a gradual return of the original symptoms: tearing that had improved after surgery starts creeping back, sometimes accompanied by discharge or recurrent swelling near the inner corner of the eye. A review of failed DCR cases found that excessive scar formation within the rhinostomy, an undersized bony window, or an improperly positioned opening were the structural causes of failure.7PubMed. Retained stenting material: an unusual cause of dacryocystorhinostomy failure Retained stenting material was another cause in that series, an underappreciated problem that can seed chronic inflammation and accelerate closure.
Granulomas and Synechiae
Granulomas are small bumps of inflammatory tissue that can grow around the ostium or around stent material inside the nose. Synechiae are bands of scar tissue that form between the nasal septum and the lateral nasal wall, bridging a gap that should remain open. Both can block the surgically created passage even when the ostium itself has not scarred over. In one endonasal DCR series, granulomas accounted for five of fourteen post-operative obstructions, while synechiae caused two more.8PubMed Central. Success rate and complications of endonasal dacryocystorhinostomy with unciformectomy
From the patient’s perspective, granulomas and synechiae present in the same way as ostium closure: tearing gradually returns weeks or months after an initially successful surgery. You cannot tell which of these problems is causing your symptoms without a nasal endoscopy. The good news is that granulomas and synechiae are usually manageable in the clinic or with a minor revision procedure rather than a full repeat surgery.
Stent-Related Complications
Many surgeons place silicone tubes (stents) through the new passage to keep it open during healing. While stenting can improve success rates, the tubes themselves are a source of complications. The two most common stent problems are canalicular cheese-wiring, where the tube slowly cuts into the delicate tissue of the tear drainage channels, and tube prolapse, where part of the stent slips out of position. A randomized clinical trial found each of these occurring in roughly 4% of stented cases.9PubMed. Bicanalicular Silicone Stents in Endonasal Dacryocystorhinostomy: Results of a Randomized Clinical Trial
A prolapsed stent often announces itself as a visible loop of tubing poking out from the inner corner of the eye or hanging in the nostril. Resist the urge to pull on it. Tugging a partially displaced stent can lacerate the punctum (the tiny opening at the eyelid margin where tears enter the drainage system) or the canaliculus, creating a new problem on top of the old one. Complications from stent manipulation can include punctal lacerations and canalicular obstruction.10PubMed. Outcomes of 3-mm lacrimal balloon dilation in post-DCR common canalicular mucosal stenosis: A minimally invasive recovery approach If you notice your stent has moved, tape it loosely to your cheek and call your surgeon.
Lacrimal Sump Syndrome
This is a complication that catches many patients off guard because irrigation in the office works perfectly, yet tearing and even infection persist. It happens when the ostium is open but sits too high on the lacrimal sac, leaving a pocket of sac below the opening where tears and mucus pool and stagnate. One reported case involved a patient whose tearing and recurrent dacryocystitis returned eight months after endonasal DCR despite having a large, clearly visible ostium on endoscopy. The residual sac below the opening was harboring bacteria.11PubMed. A Lacrimal Sump Syndrome With a Large Intranasal Ostium
Sump syndrome is worth knowing about because it mimics a straightforward surgical failure but requires a different fix. Simply enlarging the ostium will not help; the residual sac pocket needs to be addressed, usually by marsupializing it or removing it during a revision procedure.
Cerebrospinal Fluid Leak
This is the complication that surgeons dread most, though it is genuinely rare. The bone separating the operative field from the floor of the brain (the anterior cranial fossa) can be as little as 5 mm away from the upper edge of the bony window created during surgery.12PubMed. Cerebrospinal fluid leakage after dacryocystorhinostomy A fracture of the thin bone in this area can result in a leak of cerebrospinal fluid into the nose. Case reports have identified the fovea ethmoidalis, the paper-thin roof of the ethmoid sinuses, as the typical site of breach during endonasal DCR, especially when the osteotomy extends too far back or upward from the lacrimal sac.13PubMed. Complications of Cerebrospinal Fluid Leak During Endonasal Dacryocystorhinostomy: Case Series and Review of Literature
For a patient, the key warning sign is persistent, clear, watery fluid dripping from one nostril, especially when leaning forward. This is different from the expected blood-tinged or mucousy drainage of normal healing. If you notice a thin, watery nasal drip that tastes salty and will not stop in the days after surgery, it needs urgent evaluation. Untreated CSF leaks carry a risk of meningitis.
How Complications Differ Between External and Endonasal DCR
The two main surgical approaches carry somewhat different complication profiles. External DCR, done through a small skin incision near the nose, has the unique downside of a visible scar. About 12% of external DCR patients in one review had notable cutaneous scarring.14PubMed. Primary external dacryocystorhinostomy versus primary endonasal dacryocystorhinostomy: a review Endonasal DCR avoids this entirely but, at least when done with laser, has historically shown lower overall success rates compared to external DCR. A meta-analysis found that endoscopic mechanical DCR achieved results comparable to external DCR, while endoscopic laser DCR had poorer outcomes.15PubMed. Systematic review and meta-analysis on outcomes for endoscopic versus external dacryocystorhinostomy
Intraoperative bleeding is substantially more common with the external approach. One comparative study documented bleeding events in 48% of external cases versus 4% of endonasal cases.16PubMed Central. Endoscopic vs external dacryocystorhinostomy-comparison from the patients’ aspect The same study found that endonasal patients reported less pain in the first week and greater satisfaction with the cosmetic result. The meta-analysis comparing the two approaches also found that endonasal DCR carried a lower risk of scarring and infection, though bleeding rates after surgery were statistically similar between the two.15PubMed. Systematic review and meta-analysis on outcomes for endoscopic versus external dacryocystorhinostomy Neither approach is universally superior; the choice depends on the anatomy, the surgeon’s expertise, and whether revision surgery is being considered.
How Surgeons Investigate a Suspected Complication
If you report returning symptoms, your surgeon will typically run through a standard set of tests in the office. These include irrigating the lacrimal system with saline (you feel a flush in the nose if the passage is open), probing with a thin metal probe, instilling fluorescein dye to see whether it drains, and performing nasal endoscopy to directly inspect the ostium.17PubMed Central. Cause and Management of Patients With Failed Endonasal Dacryocystorhinostomy CT scanning of the sinuses is sometimes added to look for problems that endoscopy cannot show, such as a bony window that was placed too far forward or a residual sac pocket.18PubMed. Endoscopic and Radiologic Findings in Failed Dacryocystorhinostomy: Teaching Pearls for Success
The combination of irrigation, endoscopy, and imaging can usually pinpoint exactly what went wrong: a closed ostium, granuloma, synechia, sump syndrome, or retained material. That diagnosis then determines whether a simple office procedure will suffice or a formal revision surgery is needed.
Preventing Complications With Adjuvant Treatments
Surgeons have tried various strategies to keep the new ostium open during the critical healing window. The most studied adjuvant is mitomycin C, a drug that inhibits fibroblast activity and slows scar formation. Applied topically during surgery, it aims to reduce granuloma formation and ostium closure. One study comparing mitomycin C alone, triamcinolone-impregnated nasal packing alone, and the combination of both found that the combined group achieved a success rate of about 97.5% and had a granuloma rate of only 5%, compared to roughly 15-21% in the single-agent groups.19PubMed Central. Efficacy of adjuvant mitomycin-C and triamcinolone-impregnated nasal packing for endoscopic dacryocystorhinostomy Evidence also supports the use of mitomycin C during revision DCR specifically, where the scarring risk is even higher than in primary surgery.20PubMed. Mitomycin C in revision endoscopic dacryocystorhinostomy: a prospective randomized study
From your standpoint as a patient, you cannot choose whether mitomycin C is used during your surgery, but you can ask about it beforehand. It is also worth knowing that post-operative nasal care, including saline rinses and avoiding nose-blowing for the recommended period, plays a significant role in preventing granuloma and synechia formation. The healing environment inside the nose matters as much as what happens in the operating room.
What Happens When Revision Surgery Is Needed
When a DCR fails and the cause is structural, a revision procedure is usually the next step. Revision DCR is a reasonable operation with respectable success rates, though somewhat lower than primary surgery. One series of 40 revision external DCR cases reported an 85% success rate at final follow-up.21PubMed Central. Revision External Dacryocystorhinostomy Results After a Failed Dacryocystorhinostomy Surgery A modified external revision technique achieved even higher results, with over 93% of previously failed cases successfully treated.22PubMed Central. Modified external revision-DCR in previous failed endonasal, transcanalicular or external-DCR: technical strategy and teaching Pearls for success
Revision surgery is technically more demanding than the first procedure because the surgeon is working through scar tissue and sometimes through bone that has regrown across the ostium. The choice between an external and an endonasal revision depends on why the first surgery failed. If the original bony window was too small or badly placed, an external approach gives the surgeon better control. If a granuloma or synechia is the sole problem, an endonasal approach may be sufficient and less invasive.
Pediatric DCR and Its Particular Risks
Children who need DCR, usually after failed probing or balloon dilation for congenital nasolacrimal duct obstruction, face some unique considerations. Smaller anatomy raises the difficulty of the procedure, and certain congenital conditions affect outcomes. A study of pediatric endonasal DCR found that children with punctal agenesis (where the tear drainage opening never formed) and those requiring bilateral surgery had significantly higher failure rates. After excluding cases with trisomy 21 and punctal agenesis, functional success was achieved in about 83% of cases.23PubMed. Endoscopic dacryocystorhinostomy outcomes in pediatric patients with nasolacrimal duct obstruction Parents should be aware that the presence of additional congenital anomalies can meaningfully change the expected success rate and complication profile.
Quality of Life After Successful DCR
When DCR works well, the improvement in daily life can be substantial. Patients often underestimate how much chronic tearing, discharge, and recurrent infections affect their well-being until the symptoms resolve. A study using a validated quality-of-life questionnaire found significant improvements across general well-being, social functioning, and physical comfort by three months after external DCR, with scores continuing to climb between the first and third postoperative months.24PubMed Central. Subjective outcome and quality of life following external dacryocystorhinostomy The social functioning gains were among the largest, which makes sense given that constant watery eyes can be embarrassing and interfere with reading, driving, and screen use. For patients weighing whether to proceed with surgery or revision surgery, these quality-of-life data offer a useful counterweight to the complication statistics.