Conservative management of self-induced pneumoparotid in a 46-year-old male: A case report

Abstract

Pneumoparotid is a rare cause of parotid gland swelling characterized by the presence of air within Stensen’s duct and/or the parotid gland itself. It is often confused with more common causes of parotid enlargement, such as infection, and may be self-induced or associated with increased intraoral pressure. Awareness of this entity is important to avoid misdiagnosis and inappropriate treatment. We report an adult case of self-induced pneumoparotid in a 46-year-old male who developed recurrent bilateral parotid swelling over several months due to intentional oral auto-insufflation performed to relieve temporomandibular joint discomfort and anxiety. On otolaryngology evaluation, he had mild, soft, non-erythematous parotid swelling with subtle crepitus over the left gland. Computed tomography of the head and neck demonstrated air within both Stensen’s ducts, the parotid parenchyma, and the overlying facial subcutaneous tissues, with no signs of inflammation or abscess. The patient was afebrile and without leukocytosis, and a diagnosis of self-induced pneumoparotid was established. He was managed conservatively with counseling to discontinue the pressure-generating maneuvers, and no procedural intervention was required. The swelling resolved with behavior modification, and he remained free of recurrence over 3 months. This case highlights pneumoparotid as an important differential diagnosis for recurrent, noninfectious parotid swelling and demonstrates that early recognition combined with targeted history-taking and conservative management can prevent unnecessary invasive treatments and serious complications, even in adult patients.

Introduction

Pneumoparotid is defined as the reflux of air into the parotid gland parenchyma and/or Stensen’s duct, leading to distension of the gland with air.^1,2 It typically results from an incompetent valve mechanism at the parotid duct papilla combined with elevated intraoral pressure, allowing air to travel backward into the ductal system.^1,2 This retrograde insufflation of air can acutely distend the gland and may rupture acini, causing air leakage into surrounding tissues.^1,2

Clinically, pneumoparotid often presents as recurrent, painless parotid swelling without signs of infection.^1,2,8,9,10 Patients may report precipitating events that increase intraoral pressure, such as cheek puffing, glass blowing, playing wind instruments, vigorous coughing, or sneezing.^1,2,8,9,10 On examination, a pathognomonic finding is crepitus over the parotid region due to air in the gland, and one may observe bubbles or frothy saliva at the duct orifice when massaging the gland.^1,9 If secondary infection develops (pneumoparotitis), patients may also develop signs of parotid inflammation (pain, warmth, erythema, fever).^1,4,9

The differential diagnosis for parotid swelling is broad, including acute suppurative parotitis, viral parotitis (e.g. mumps), chronic granulomatous infections, sialolithiasis, noninfectious sialadenosis, autoimmune sialadenitis, and benign or malignant neoplasms.^1,2 Unlike pneumoparotid, many of these conditions present with distinct clinical or imaging features.^1,2 Treatment for pneumoparotid is often conservative and differs significantly from that of more common etiologies of parotid swelling; recognition of pneumoparotid helps prevent unnecessary or overly aggressive interventions.^1,2,4,9,10

Recent systematic reviews and literature syntheses have clarified that pneumoparotid is rare across all ages and that self-induced cases are most frequently reported in children and adolescents, with adults comprising a smaller proportion of cases.^1,2,5,6,10 Our case of self-induced pneumoparotid in a 46-year-old male, therefore, adds to the limited adult literature and underscores the need to consider this diagnosis beyond pediatric and adolescent populations.^1,2

Imaging plays a vital role in confirming the diagnosis of pneumoparotid and excluding other pathologies. Plain radiographs in acute cases may show air in the ductal system or parotid region, but ultrasound is a more sensitive, noninvasive tool that typically shows multiple hyperechoic foci with acoustic shadowing corresponding to air bubbles.^2,7–9 Computed tomography (CT) is considered the gold standard imaging modality for pneumoparotid, as it vividly depicts intraductal and intraglandular air, delineates the extent of air dissection into surrounding tissues, and rules out complications such as deep neck emphysema or pneumomediastinum.^{1,2,4,7–9,11} A specialized “puffed-cheek” CT technique, in which the patient blows out the cheeks during the scan, can accentuate subtle air reflux. ³

In the present report, we describe an adult patient with self-induced pneumoparotid managed conservatively with behavior modification, emphasizing key elements of the interview, imaging findings, and follow-up that helped avoid unnecessary intervention.

Case presentation

A 46-year-old male presented with a several-month history of intermittent swelling in both parotid regions, most prominently in the left preauricular area. He reported that he habitually insufflated his mouth and puffed his cheeks against pursed lips, generating a Valsalva-type increase in intraoral pressure to alleviate discomfort in his temporomandibular joints (TMJs). He also reported using the same maneuver during episodes of anxiety. He was instructed to discontinue these behaviors once their potential relationship to his swelling was discussed.

The swelling was not acutely painful but caused a sense of fullness and mild discomfort. It was not associated with fever, malaise, or purulent discharge and typically resolved spontaneously within a few hours. His medical history was otherwise unremarkable, with no prior major illnesses and no known allergies. There was no history of recent dental procedures, facial trauma, or use of positive-pressure devices such as continuous positive airway pressure (CPAP). Family history was non-contributory.

On initial evaluation, the patient was afebrile and not in distress. Both parotid regions appeared mildly swollen without redness or increased warmth. The swelling was soft on palpation, and crepitus was not prominently appreciated at that time. No pus or debris was observed from Stensen’s duct openings.

At subsequent otolaryngology clinic assessment, the patient again demonstrated mild bilateral parotid swelling, slightly greater on the left. The overlying skin remained non-erythematous and non-tender, and there was no increased warmth. On gentle palpation, subtle crepitus was appreciated over the left parotid region, consistent with air within the gland. The remainder of the head and neck examination was normal, with no lymphadenopathy; otoscopic and oropharyngeal examinations were unremarkable. TMJ examination revealed only mild discomfort without clicking, locking, or limitation of range of motion, and no gross malocclusion was noted. Figure 1, a lateral photograph of the patient’s left cheek, clearly demonstrates mild swelling in the preauricular region that correlates with the clinical findings of pneumoparotid.

Figure 1.

Lateral view of the patient’s left preauricular swelling.

Laboratory investigations, including a complete blood count and comprehensive metabolic panel, were unremarkable, with no evidence of leukocytosis or other abnormalities.

CT imaging of the head and neck (Figure 2) demonstrated nonspecific subcutaneous emphysema with scattered foci of gas involving both sides of the face. Multiple small gas foci were seen along the expected course of both Stensen’s ducts, within the parotid gland parenchyma bilaterally, and in the overlying facial subcutaneous tissues, particularly in the left preauricular region correlating with the area of maximal swelling. No evidence of significant glandular inflammation, abscess, deep neck emphysema, or pneumomediastinum was identified. These findings are consistent with pneumoparotid in the setting of retrograde air insufflation.^2,4,7–9,11

Figure 2.

Axial CT image of the sinuses demonstrating subcutaneous emphysema and scattered foci of gas within the bilateral facial subcutaneous tissues. A prominent pocket of air is visible in the left preauricular region, corresponding to the palpable swelling on clinical examination.

Given the benign nature of the condition in this patient (air without infection, abscess, or extensive dissection), a conservative management strategy was adopted.^1,2,4,8,9,10 The patient and his family were educated about avoiding deliberate Valsalva-type or cheek-blowing maneuvers and informed of potential complications (e.g. deeper cervical emphysema or pneumomediastinum) if such behaviors continued.^1,9,11 Because his TMJ discomfort was mild and improved after discontinuing the behavior, additional imaging of the TMJ was not pursued; however, he was advised to seek dental or gnathologic evaluation if TMJ symptoms persisted or worsened. Antibiotics and surgical interventions were not deemed necessary.^4,9,10

At follow-up, his parotid swelling resolved fully after behavior modification, and he reported no further episodes of facial swelling or crepitus over a period of 3 months. This favorable course supports the potential for conservative therapy with behavior modification to be curative in self-induced pneumoparotid.^{1,2,4,9,10,11}

Discussion

Pneumoparotid arises when elevated intraoral pressure overwhelms the protective mechanisms of Stensen’s duct—such as a narrow ductal orifice, mucosal folds functioning as a one-way valve, and compression by the buccinator muscle—resulting in retrograde air insufflation into the ductal system and parotid parenchyma.^1,2 In our patient, intentional cheek puffing against pursed lips generated high intraoral pressure, akin to a Valsalva maneuver, precipitating air reflux into the ducts and parotid tissue with associated subcutaneous emphysema.

Pneumoparotid can be classified as self-induced, occupational, iatrogenic, or idiopathic.^1,2,8,9 Self-induced pneumoparotid is frequently reported, particularly in younger patients.^1,2,5,6,10 However, it is not exclusive to children, as demonstrated by our 46-year-old patient. Yoshida’s systematic review and subsequent literature updates have shown that self-induced cases, often related to cheek-puffing behaviors, are most commonly reported in children and adolescents, with adults representing a minority of cases.^1,2,5,6,10 Our case, therefore, contributes to the relatively small body of adult, self-induced pneumoparotid and underscores that this diagnosis should be considered across a broader age range.^1,2

Targeted history-taking is critical for early recognition.^{1,2,4,8,9,10,11} In addition to asking about the duration and pattern of parotid swelling, clinicians should specifically inquire about behaviors that increase intraoral pressure, including cheek-puffing or Valsalva-type maneuvers (as in our patient), covering the mouth tightly while coughing or sneezing, recent dental procedures or use of positive-pressure devices such as CPAP, or unusual repetitive oral habits, including tic-like behaviors in children or adolescents.^{4–6,9,10,11}

A careful interview may reveal self-induced or inadvertent behaviors that patients initially consider trivial or unrelated to their symptoms.^{1,2,4–6,9,10,11} Our patient’s cheek-puffing maneuver, performed to relieve TMJ discomfort and during anxiety, only emerged after directed questioning.

Imaging, particularly CT, is essential for confirming the diagnosis, delineating the extent of air, and excluding complications.^{1,2,4,7–9,11} In this case, CT demonstrated air in Stensen’s ducts, the parotid parenchyma, and overlying subcutaneous tissues without deep neck emphysema or pneumomediastinum. This pattern aligns with previous reports in which CT clearly depicts intraductal and intraparotid air and, when present, deep fascial spread.^2,4,7–9,11 The “puffed-cheek” CT technique described by Bhat et al. can be particularly useful when only subtle air reflux is present. . ³

Recurrence and follow-up

Recurrence of pneumoparotid is not uncommon, particularly when precipitating behaviors persist, and has been reported in a substantial proportion of published cases.^{1,2,4,9,10,11} Given these recurrence data and the potential for complications such as cervical emphysema or pneumomediastinum, it is reasonable to monitor patients, especially those with self-induced or recurrent disease, with earlier reassessment if swelling, crepitus, or pain recur or if new complications develop.^{1,2,4,9,10,11}

In our case, the patient remained asymptomatic without recurrence over 3 months, suggesting that simple, targeted behavioral counseling may be sufficient for durable resolution when the provoking behavior is clearly identified and successfully discontinued.

Behavioral and psychological considerations

In our patient, the cheek-puffing maneuver functioned as a self-directed response to TMJ discomfort and anxiety. We discussed the relationship between this behavior and his symptoms, emphasized the importance of discontinuing the maneuver, and advised follow-up with his primary care provider and mental health services if anxiety symptoms persisted or worsened. A formal psychiatric evaluation was not performed because his symptoms and behavior improved after counseling. Similar associations between self-induced pneumoparotid, psychosocial stress, anxiety, or tic-like behaviors have been described in pediatric and adolescent cases.^5,6,10,11

TMJ discomfort and etiologic considerations

The patient’s pneumoparotid appeared behaviorally driven by attempts to relieve TMJ discomfort. In our case, TMJ examination showed only mild tenderness without mechanical symptoms or significant dysfunction, and symptoms improved with behavior modification alone. Nevertheless, clinicians should consider underlying TMJ pathology as a potential contributor to the development of pressure-generating behaviors, and referral for dental or gnathologic evaluation may be helpful if TMJ symptoms persist.^1,2

Overall clinical implications

Early recognition of pneumoparotid is facilitated by a targeted interview that elicits specific high intraoral pressure behaviors. CT imaging confirms the diagnosis, localizes air within Stensen’s ducts and parotid parenchyma, and excludes serious complications. Conservative management with behavior modification can be curative, even in adult self-induced cases, and may obviate the need for antibiotics, duct ligation, or parotidectomy when no infection or recurrent severe disease is present. Follow-up over several months is warranted due to non-trivial recurrence rates, particularly if provoking behaviors are not fully eliminated.

Conclusion

Pneumoparotid is a rare but important cause of parotid swelling that must be distinguished from infectious and obstructive etiologies. In this adult case of self-induced pneumoparotid, careful history-taking revealed a Valsalva-type cheek-puffing habit used to relieve TMJ discomfort and anxiety, while CT imaging confirmed air within Stensen’s ducts, the parotid parenchyma, and the overlying subcutaneous tissues without complications. Early recognition of this pattern allowed for conservative management with behavior modification alone, avoiding unnecessary antibiotic therapy and invasive interventions. Clinicians should routinely ask about intraoral pressure-generating habits in patients with recurrent, noninfectious parotid swelling and provide counseling and longitudinal follow-up to reduce the risk of recurrence and complications.