Pyogenic granuloma, sometimes known as granuloma pyogenicum, refers to a common, acquired, benign, vascular tumor that arises in tissues such as the skin and mucous membranes. The scientifically accurate term for this entity is the lobular capillary hemangioma. In the past, pyogenic granulomas were thought to be an exaggerated granulomatous reaction to an infectious or pyogenic insult, which led to the use of terms such as ‘pyogenic granuloma’ and ‘granuloma pyogenicum.’ However, the term pyogenic granuloma is a misnomer that may initially cause confusion.
The lesion grossly appears as a solitary, red, pedunculated papule that is very friable. Less commonly, it may present as a sessile plaque. It shows rapid exophytic growth, with a surface that often undergoes ulceration. It is often seen on cutaneous or mucosal surfaces. Among the latter, it is most commonly seen within the oral cavity. Rarely, it may occur at other sites within the gastrointestinal tract.
When it occurs in the intraoral mucosa in the setting of pregnancy, notably on the gingiva, it is referred to as granuloma gravidarum, granuloma of pregnancy, or epulis gravidarum, usually in the second or third trimester. There is a case reported in the literature where a patient developed multiple disseminated lesions while on therapy with oral contraceptive pills and one report with the development of lesions after a renal transplant.
Various factors are implicated in the etiopathogenesis of this entity, but the exact cause is unknown. Studies investigating specific angiogenic factors and signal transduction pathways have yet to implicate a single pathway for the pathogenesis of the lesion. Proposed mechanisms emphasize the importance of insults resulting in an imbalance of pro-angiogenic and anti-angiogenic factors, which lead to a rapid proliferation of capillaries of a neovascular, friable, and lobulated character. Reactive granulation tissue from minor trauma may be contributory; however, studies attribute only up to 7% of these lesions directly to a history of trauma. Other possible predisposing factors may include infections and preexisting vascular malformations.
Hormonal factors appear to play a role in the pregnancy-associated phenotype of this lesion. There is also a later peak incidence in women, typically during childbearing years. Opponents of this theory emphasize the paucity of vaginal mucosal lesions, together with a slight predilection of cutaneous lesions in men. It is hypothesized that estrogens and other sex hormones exaggerate inflammatory responses in gingival tissue, particularly in pregnancy. Further studies must be undertaken to determine their true significance in the etiology of this entity.
Certain variants of lobular capillary hemangioma have also shown an association with medication use. Of these variants, multiple periungual pyogenic granulomas occur most frequently in association with medications (reports suggest up to 30% of these are associated with medications) and are also seen in association with other chronic dermatoses as atopic dermatitis and psoriasis. Drugs implicated most often include:
Disseminated pyogenic granulomas, a rare entity, have been documented to occur with isotretinoin use in patients with severe nodulocystic acne and the use of granulocyte colony-stimulating factor (G-CSF) in immunodeficient patients.
Intraoral pyogenic granulomas are seen in patients on cyclosporine and tacrolimus after hematopoietic stem cell transplant. Several case reports support this hypothesis, especially with patients treated for either acute or chronic graft versus host disease with cyclosporine or tacrolimus.
Pyogenic granuloma may be seen in patients of all ages. Conflicting reports exist on the epidemiologic pattern of disease.
In one review, the incidence peaked in the second decade of life, and the lesion showed a slight male preponderance in certain studies. However, mucosal lesions were more common in females than males in this review and were seen predominantly in the fourth decade of life in this cohort.
In another review, the ratio of males to females was 1 to 1.2. In this review, when considering both cutaneous and mucosal variants, male patients appear to present at a younger age, typically from childhood to the late twenties, compared to women, who usually present later in life between the ages of thirty to forty. When considered on its own, mucosal pyogenic granuloma appears to occur at any time in men. In comparison, most cases in women occur before age forty.
In a pediatric study, the average age at diagnosis was 6 to 10 years, with a male preponderance.
Histologically, a lobular capillary hemangioma consists of lobular aggregates of capillary-sized vessels, with each lobule containing a central feeder vessel. These develop within highly vascular granulation tissue, with the lobules or tufts of thin-walled capillaries embedded within a loose fibrous stroma, with scattered fibroblasts and a variegated inflammatory infiltrate.
At low power, the architecture resembles a well-circumscribed, exophytic, polypoid mass. The overlying epidermis is variably involved but often thinned or atrophic, progressing to erosion and ulceration with severity. Features of superadded infection may be seen. An epidermal collarette is often present, composed of either acanthotic elongated rete ridges or hyperplasia of adnexal structures that separate these lesions from the underlying dermis. Within the papillary and upper reticular dermis, collections of these capillary-sized vessels are arranged into lobules and separated by fibromyxoid stroma. Within the stroma, a scarce, mixed inflammatory infiltrate is noted, consisting of lymphocytes, neutrophils, plasma cells, or mast cells, resembling normal granulation tissue. A study noted a normal number of mast cells within these lesions compared to increased numbers seen in the proliferative phase of a typical hemangioma. The capillaries lobules in the lesion's superficial regions are more distinctive and lined by flattened to slightly plump endothelial cells, with a progressive change in the deeper parts of the lesion, where increased cellularity leads to overlapping, small, and indistinct lumens. Mitotic activity within the lesion is highly variable.
Immunohistochemistry staining is often not necessary given the characteristic clinical history and histologic architecture. Atypical lesions may, however, necessitate the use of IHC stains. The lesion stains positive for vascular markers like CD31, CD34, and factor VIII antigen, but unlike infantile hemangioma, are negative for glucose transporter-1 (GLUT1).
When seen, intravascular pyogenic granulomas typically occur within a vein and resemble cutaneous lesions with a lobular capillary proliferation set in a fibromyxoid stroma. The lesion hangs from a fibrovascular stalk that connects to the intima of the vein.
On the other hand, a granuloma is represented by an aggregation of macrophages with or without surrounding inflammatory infiltrate. These develop as a response to an antigenic stimulus, often an infectious pathogen or a foreign body. The initial histologic misconception that pyogenic granulomas were granulomatous with an additional mixed inflammatory infiltrate consisting of neutrophils lead early investigators to assume these lesions were most likely analogous to traditional granulomas. Extensive investigations have since failed to identify a definite infectious agent as a trigger for these lesions, and these lesions are neither pyogenic nor granulomatous. To correct the misleading terminology, Mills et al. suggested using the more accurately descriptive term lobular capillary hemangioma. However, the older term continues to see routine use.
A lobular capillary hemangioma typically starts as a small, red papule. It then undergoes a variable, sometimes rapid, exophytic growth phase over weeks to months, eventually stabilizing in size. The color may vary from red to reddish-brown or purple. The diameter varies from a few millimeters for small lesions to several centimeters for larger lesions. Lesions are typically solitary, but satellite lesions may develop in proximity, and sometimes disseminated lesions may be noted. Mature lesions are polypoid or pedunculated and have a "collarette" of scale at the base of the lesion. This epidermal collarette may help identify the lesion, but it is not unique to this entity and may be seen in other conditions that show lesions erupting rapidly through the epidermis. Sessile lesions are rare. The surface is often friable, and the lesion can show profuse bleeding with even minor trauma. Bleeding is recurrent due to unavoidable trauma and may become difficult to control. Patients present to the clinic with band-aids applied over the lesions, an attempt to prevent trauma and bleeding from the lesion – colloquially termed the "band-aid sign."
A lobular capillary hemangioma can occur on any normal cutaneous or mucosal site. Cutaneous lesions occur more frequently than mucosal lesions. In some instances, the lesion may also occur over vascular malformations, such as a nevus flammeus (port-wine stain).
There is conflicting data regarding the most common site of involvement for cutaneous and mucosal PG. In adults, cutaneous PG appears to occur more frequently on the trunk and extremities (where it is more common on the upper than the lower extremities), followed by head and neck lesions, as opposed to children, in whom the lesions have a predilection for the head and neck region, followed by the trunk and extremities.
A unique entity within cutaneous PG is subungual or periungual PG, which usually presents at the proximal or lateral nail fold and may even erupt on multiple digits.
For mucosal PG, common locations include lips and gingival mucosa. Some studies cite the tongue as the most common site, followed by the gingivae, nasal mucosa, conjunctiva, cervix, and vagina. Other authors suggest that the gingiva is the most common site for mucosal PG. In pregnancy, the lesion occurs most frequently over the buccal mucosa and gingivae.
Multiple lesions can occur in one of two distinct clinical variations: satellite lesions around a primary lesion or a disseminated form. Satellite forms favor the trunk, involving perilesional skin near the initial lesion following treatment or trauma. Disseminated lesions are extremely rare but have been reported in the literature, occurring in an eruptive fashion with no predilection for any particular site.
Occasionally, lobular capillary hemangiomas are found in subcutaneous or intravascular locations. Subcutaneous pyogenic granulomas typically occur in females and present as a well-circumscribed subcutaneous nodule. Intravenous pyogenic granulomas typically present as a slow-growing, well-circumscribed, soft, subcutaneous nodule typically on the neck or upper extremities.
Rarely, lobular capillary hemangioma develops in the gastrointestinal tract, where it mimics polyps. Gastrointestinal tract lesions may be asymptomatic or present with overt bleeding or obscure chronic bleeding, causing anemia.
A summary of certain clinical variants of lobular capillary hemangioma is described below:
Lobular capillary hemangioma is usually a clinical diagnosis made based on history and classical clinical findings. The history should include inquiries into previous trauma, association with pregnancy, and a thorough review of medications.
In some instances, a dermoscopic examination is valuable. Lesions show a pink or red homogenous papule with a scaly, white "collarette." Occasionally, white lines that intersect may be seen and represent fibrous septa.
If a diagnosis cannot be achieved on clinical grounds, a histologic examination is warranted. Some may choose to excise these lesions to alleviate patient anxiety rather than diagnostic uncertainty. Irrespective of the deciding factor for excision, it is strongly recommended that the tissue is sent for histopathologic confirmation to rule out any other sinister lesions.
Lobular capillary hemangiomas show frequent ulceration and bleeding, which is the usual cause that warrants treatment. Clinical trials are limited, and hence there is no accepted standard of care for treating these lesions. Different treatments have variable degrees of success and variable rates of recurrence. No matter the treatment, the patient should be counseled about the risk of recurrence.
In non-visible areas, complete excision is the preferred method of lesion removal because of lower rates of recurrence and an excellent specimen for histopathologic characterization. The excision is performed under local anesthesia. For sessile lesions or recurrent lesions, surgical excision with suturing is preferred and overall results in less postoperative bleeding with a lower recurrence rate.
Shave excision or curettage followed by electrocautery may be used for cosmetic areas, but recurrence is more common with these modalities. Other modalities include non-surgical avenues such as cryotherapy, electrocautery or chemical cautery with silver nitrate without excision, and laser therapy. Lasers that have seen use include pulsed dye laser (PDL) or CO2 lasers, and long-pulsed 1,064 nm Nd:YAG laser either on their own or combined with surgical intervention.
For small lesions in cosmetically sensitive areas or lesions in children, practitioners may consider non-operative management with pulsed dye laser, CO2 laser ablation, or electrocautery if laser therapies are not available.
Medical management is generally not recommended. A variety of topical or intralesional treatments have seen use with variable responses. These include topical imiquimod cream, alitretinoin gel, timolol, propranolol, and even phenols for periungual lesions. Intralesional therapy with corticosteroids, sclerosants such as ethanolamine oleate, sodium tetradecyl sulfate, polidocanol, and bleomycin have shown sporadic benefit in patients.
In cases of pregnancy or medication-induced lobular capillary hemangiomas, the recurrence rate after treatment is higher. Medication should be discontinued if possible. For patients on antineoplastic medications, where stopping the medication is not possible, management is symptomatic. For example, in the case of epidermal growth factor receptor inhibitor-related lesions, the Multinational Association for Supportive Care in Cancer (MASCC) Skin Toxicity Study Group has published guidelines preventing and treating lobular capillary hemangiomas, recommending weekly chemical cauterization, electrodesiccation, or nail avulsion.
While a lobular capillary hemangioma is easily diagnosed based on a history and examination, it is important to consider certain red flag diagnoses that may prove harmful. These include lesions such as (this is by no means an exhaustive list):
In immunosuppressed individuals, bacillary angiomatosis or Kaposi sarcoma should also be included in the differential.
Benign lesions that may need to be distinguished from lobular capillary hemangiomas include:
On histopathology, the list of differential diagnoses includes other forms of capillary hemangiomas, including, but not limited to: acquired tufted angioma, glomeruloid hemangioma, and infectious angiomatoses such as bacillary epithelioid angiomatosis and verruga peruana.
These lesions have no malignant potential. However, since they do not regress spontaneously and may bleed, ulcerate, or be cosmetically disfiguring, they may necessitate treatment on these grounds. Oral pyogenic granulomas occurring in pregnant women usually regress once they deliver their child.
Partial resection by shave excision or curettage may lead to recurrence in the future; hence complete primary excision is preferred. For recurrence, complete surgical excision is warranted.
Possible complications of lobular capillary hemangioma include:
Patients typically need reassurance for this condition since they may be worried about more sinister conditions. They should be discouraged from scratching or picking at the lesion and must take some precautions to avoid trauma or secondary infection of the lesion. They should be advised about the risk of recurrence with partial excisions and the risk of scarring with a total surgical excision. The decision of which modality to use for the lesion must be arrived at jointly by the patient and their physician.
Lobular capillary hemangiomas are friable lesions that may lead to undue anxiety for patients, parents, and healthcare providers who are not familiar with the lesions and their prognosis. Given the somewhat abrupt onset, patients may present in a variety of settings such as urgent care, primary care, pediatric clinics, dermatology clinics, or sometimes even seek an oncologist or surgeon.
As these lesions are common in children, pregnant women, and patients on certain medications, a strong link is needed with specialists such as a dermatologist for appropriate treatment of these lesions by a suitable modality. It bears repeated emphasis that when these lesions are excised, partially or wholly, specimens must always be sent for histopathologic assessment to rule out red-flag diagnoses.
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