Auricular Hematoma

Etiology

Auricular hematomas result from blunt ear trauma, often due to shearing impacts rather than direct blows.[3] The condition is commonly seen in athletes engaging unprotected in contact sports like wrestling and rugby, though various other causes exist. In 2020, Dalal et al's study reported that 40% of auricular hematomas in 87 patients resulted from sports injuries, with assaults and falls each accounting for 10%. Self-harm and postoperative cases may give rise to a few auricular hematoma cases.[4]

Helical piercing is also known to cause pinna hematoma and subsequent bacterial infection. Patients with certain systemic conditions, such as relapsing polychondritis and psoriasis, are prone to developing auricular hematomas. Spontaneous auricular hematomas have also been reported in the literature.[5][6] Anticoagulation increases the risk of spontaneous auricular hematoma and blood accumulation after minor trauma. Children with recurrent auricular hematomas, despite lack of involvement in high-risk sporting activities, should undergo evaluation for potential nonaccidental trauma.[7]

Epidemiology

Characterizing auricular hematoma's epidemiology is challenging due to the potential underreporting of patients not seeking medical care. However, a 1989 survey of over 500 US college wrestlers revealed significant differences in hematoma incidence based on the use of headgear. About 52% of individuals who did not use protection were reported to develop auricular hematoma at least once, compared to only 26% of people who used headgear. Additionally, cauliflower ear deformity rates were 10.6% among individuals who used headgear, compared to 26.6% in people who did not use protection. Regrettably, more than 90% of wrestlers wear headgear inconsistently, primarily during competitions, leading to higher hematoma rates during practice, especially without coaches' supervision.[8][9]

A 2020 retrospective study found that 86% of patients with auricular hematoma at a tertiary care medical center were male. A slight predilection for right-sided injuries may also exist, but more data are needed for confirmation.

Pathophysiology

Debate surrounds the typical location of blood accumulation in auricular hematoma, with subcutaneous, subperichondrial, and intracartilaginous sites proposed. A 1975 study by Ohlsén et al demonstrated that blood injected into rabbit ears' subperichondrial space resulted in neocartilage formation, similar to human cauliflower ear evolution, suggesting a subperichondrial location.[10] However, a similar study by Pandya in 1973 found that hematomas tended to form within microfractures of auricular cartilage in rabbits after applying a blunt force, a finding supported by subsequent human and canine studies. While both subperichondrial and intracartilaginous locations may occur, definitive evidence for prevalence is lacking.[11][12]

The auricle receives a rich blood supply from 2 carotid artery branches, the superficial temporal and posterior auricular arteries. The latter is the primary source, perfusing the posterior aspect and conchal bowl via branches perforating the cartilage (see Image. Posterior Auricular Artery). The superficial temporal artery supplies most of the anterior surface through its upper, middle, and lower branches. Microvasculature along the antihelix and helical arcade forms an anastomosis between the superficial temporal and posterior auricular arteries and serves as the blood source during auricular hematoma formation.[13]

The posterior pinna has thicker subcutaneous tissue and muscle. Thus, hematomas are more likely to form on the anterior surface, where minimal soft tissue cushioning makes the cartilage vulnerable to trauma. Shearing injuries have been shown to produce more hematomas than trauma perpendicular to the ear. An auricular hematoma can lead to vascular compromise and venous congestion, potentially causing cartilage necrosis. New fibrocartilage deposition by chondroblasts results in the characteristic distortion seen in cauliflower ear deformity.

Histopathology

The clotting cascade typically takes approximately 6 hours to convert a liquid hematoma into a semisolid mass. Thus, aspiration with a large-bore needle is relatively easy during the initial hours postinjury. However, as the clot organizes, incision, drainage, and irrigation become necessary after several hours. The clot begins to break down after several days, returning to a liquid state over about a week, allowing for needle aspiration again. However, pathologic neocartilage formation may start as early as 7 to 10 days postinjury, emphasizing the importance of promptly addressing the hematoma upon presentation.[14]

History and Physical

History

Auricular hematoma typically presents with symptoms such as pain, swelling, tenderness, and paresthesia in the affected ear. Patients may complain of ear fullness or pressure, accompanied by difficulty hearing. The skin over the hematoma may appear red and bruised, with the pinna visibly swollen or distorted. Blood or fluid drainage from the ear canal may occur in severe cases. Associated symptoms, such as headache or dizziness, may also be reported if the hematoma is large or if temporal structures are compressed.

The history should include inquiries about recent auricular trauma, ear pain or tenderness, previous similar episodes, fevers or chills, ear drainage, hearing changes, sudden salty rhinorrhea, or neurological symptoms like headache, loss of consciousness, or cranial neuropathy. Ear injuries during high-risk sports may coincide with closed head or cervical spine trauma.

Systemic conditions like psoriasis, relapsing polychondritis, hypertension, bleeding disorders, and anticoagulation may predispose to auricular hematomas. However, spontaneous cases are significant, accounting for 31% in the 2020 series by Dala et al. Thus, the absence of risk factors in the patient's history does not rule out the diagnosis. Onset timing should be established on history. Auricular hematomas manifest acutely, distinguishing them from keloids or cauliflower ear deformity (see Images. Helical Keloid Scar).

Physical Examination

The physical examination should thoroughly assess the external ear, paying close attention to its baseline anatomy to spot abnormalities. Auricular hematoma signs include ear contour irregularity with swelling, ecchymosis or erythema, and fluctuance over the scaphoid fossa, triangular fossa, antihelix, or concha. Auricular lacerations or abrasions may be noted. Using an otoscope to examine the external ear canal and tympanic membrane is vital, as high-energy blunt trauma may cause temporal bone fractures, often evidenced by external auditory canal laceration and hemotympanum.[15][16]

An auricular pseudocyst typically lacks trauma signs or ecchymosis. However, differentiating auricular pseudocysts or seromas from hematomas is not critical, as treatments for these conditions are similar.[17] Otitis externa, which has more external auditory canal involvement but can also present with significant pinna edema and erythema, should be distinguished from auricular hematomas.[18]

Evaluation

Auricular hematomas are typically diagnosed clinically, following a thorough history and physical examination. However, ultrasonography can provide clarity in uncertain cases with ambiguous findings and a lack of historical information. Computed tomography offers a rapid and reliable assessment of bony integrity if skull or cervical spine injuries are suspected. Magnetic resonance imaging may be needed for traumatic brain injury evaluation. A radiographic examination can identify foreign bodies. Patients on blood thinners should undergo coagulation studies to assess anticoagulation status. Extracting purulent material upon aspiration or drainage warrants Gram staining and culture with sensitivity analysis for appropriate antibiotic coverage. Hearing loss should prompt an audiometry.

Treatment / Management

Depending on severity and patient factors, auricular hematomas may be treated at the bedside or in the operating room. The procedure's risks, benefits, and alternatives must be discussed with the patient, with consent secured and documented before starting the treatment. Needle aspiration may be attempted if the patient presents within 6 hours of hematoma formation and the lesion has a diameter of less than 2 cm. On the other hand, older lesions require incision and drainage for successful treatment. Needle aspiration, incision, and drainage yield similar outcomes if performed correctly.

Clot liquefaction may permit further needle aspiration attempts for lesions untreated after 7 to 10 days. However, neocartilage may have already formed at this point, potentially requiring surgical removal. Patients may also refuse treatment and simply observe the injury if they understand the risks and likely poor cosmetic outcomes of such measures.

The steps involved in treating auricular hematomas are described below.

Preparation

The patient should be placed supine or in lateral decubitus, with the affected auricle facing the clinician. Reverse-Trendelenburg positioning may ease discomfort and reduce edema. Adequate lighting is essential, provided by an overhead examination light or portable headlight. Anesthesia and hemostasis are achieved via lidocaine with epinephrine injection as a circumauricular "diamond" block. Depending on the hematoma's location, this technique may be supplemented by direct infiltration into the conchal bowl.[19]

The auricle and surrounding skin are cleansed afterward with antiseptic agents like povidone iodine or chlorhexidine. Sterile conditions should be maintained. Required supplies include a #11 or #15 blade scalpel, an 18-gauge needle with a 10-cc syringe, a suction canister and tubing with Frazier suction tip, a hemostat, skin forceps, scissors, a needle driver, bolster material, and gauze.[20]

Needle Aspiration

The needle is inserted into the most fluctuant area while traction is applied to the 10-cc plunger, aided by a ring-handled control syringe if required. Blood is then aspirated until the hematoma is fully drained or no more fluid can be obtained. Remaining clots may be treated by a gentle massage and in-and-out needle fanning to disrupt loculations and further reduce the hematoma. Incision and drainage may be necessary if these measures are insufficient. A pressure dressing should be applied before discharging the patient. Notably, postdrainage radiation therapy is being explored for cauliflower ear prevention, with promising results in rabbit models.[21]

Incision and Drainage

Incision and drainage are often warranted after needle aspiration failure, the hematoma has remained for more than 6 hours, or the lesion's diameter exceeds 2 cm. Depending on the hematoma's location, a curvilinear incision may be made along the medial helical margin in the scaphoid fossa or within the conchal bowl. Incisions in concave areas typically result in more aesthetically pleasing outcomes than in convex surfaces. The incision is extended through the skin and soft tissue until the hematoma is reached. The blood collection is then manually expressed or suctioned out.

If purulence is present, a culture should be obtained. The cavity is then irrigated with sterile saline and inspected for hemostasis. Conservative bipolar electrocautery may be used for overt bleeding, but this occurrence is uncommon. Mild oozing, if any, may be managed with pressure or a topical thrombin/gel foam matrix.

Depending on clinical judgment, any remaining clot or hemostatic agent should be cleared before closure, with or without a drain. Closure typically involves a single-layer technique using a running, resorbable suture like 5-0 plain gut. If drainage is necessary, a Penrose (sterile rubber drain) or a small-caliber suction drain may be used. The drain is usually removed within 24 to 48 hours after placement. A pressure dressing may be applied afterward to prevent hematoma reaccumulation.

Recurrent hematomas may require a cartilage window technique, excising a small cartilage section from the scaphoid, triangular fossa, or conchal bowl, depending on the hematoma's location. This technique is often used in dogs but has demonstrated up to 100% effectiveness in preventing hematoma recurrences in humans. The technique eliminates the risk of blood reaccumulation in intracartilaginous and subperichondrial spaces.[22][23]

Pressure Options Posthematoma Evacuation

Various methods exist for applying pressure to the auricle posthematoma drainage to eliminate potential fluid accumulation space. One option is molding dental splinting material to the ear and securing it with a headband. Another is using fibrin glue to unite the perichondrium to the cartilage.[24][25] Through-and-through quilt/mattress suturing with 4-0 plain gut on a Keith needle is another alternative, favored by athletes for its absorbable sutures and lack of required dressing (see Image. Incision and Drainage of an Auricular Hematoma).[26][27](B2)

A traditional approach involves placing cotton dental rolls parallel to the helix on the anterior and posterior aspects of the auricle, secured with 3-0 nylon mattress sutures for compression. Bolster or dressing removal typically occurs after 5 to 7 days, and antibiotic use is at the clinician's discretion. Reconstruction via otoplasty may be necessary if a cauliflower ear deformity develops, which warrants a referral to an otolaryngologist, plastic surgeon, or facial plastic surgeon.

Differential Diagnosis

Infectious, autoimmune, and traumatic sources of auricular swelling must be ruled out. The most important differential diagnoses include hemangioma, cauliflower ear deformity, perichondritis, otitis externa, abscess, pseudocyst, seroma, cellulitis, keloid, Winkler disease (relapsing perichondritis), laceration, erysipelas, sunburn, and skin cancer. These conditions may resemble auricular hematoma but require different evaluation and management strategies.

Complications

Cauliflower ear deformity, an unsightly and inconvenient condition, is the most significant sequela of auricular hematoma. A misshapen ear can cause discomfort while wearing headphones or hearing protection. Earphones and earplugs may no longer fit with conchal bowl involvement. External auditory meatus stenosis may lead to conductive hearing loss and increase the risk of cerumen impaction.

Inadequately treated hematomas heighten the risk of developing a cauliflower ear, especially if recurrence follows initial drainage. Treatment by an otolaryngologist reduces the risk of reaccumulation compared to other specialists or primary care providers (25% compared to 77% reaccumulation rate), with even lower rates (14% compared to 60%) when using a bolster postdrainage. Referral to an otolaryngologist, plastic surgeon, or facial plastic surgeon is recommended for cauliflower ear reconstruction.[28]