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Atypical presentation and management of an epithelioid hemangioma: a case report and review of the literature
Annals of Pediatric Surgery volume 16, Article number: 53 (2020)
Epithelioid hemangioma is a rare, benign vascular lesion classically presenting with painless nodules in the head and neck region. Hemangioma lesions are typically small, located within the dermis and subcutaneous tissue, and rarely exceed 10 cm in size. Complete surgical excision, with negative margins, is the recommended treatment as local recurrence is common. We describe an unusual presentation of epithelioid hemangioma that, to our knowledge, has not been previously described in the literature, epithelioid.
We report an atypical case of a large epithelioid hemangioma lesion with deep intramuscular involvement in a 16-year-old male. Ultrasound and MRI showed a hypervascular mass on the patient’s left upper back, and biopsy confirmed the diagnosis. Treatment consisted of preoperative embolization followed by excision and local tissue rearrangement.
Epithelioid hemangiomas are considered uncommon in the pediatric population. Moreover, it is challenging to diagnose these lesions due to their similarities to other vascular anomalies. We aim to increase awareness of this condition and obtain more precision in diagnosis, thus standardizing the approach for those treating individuals with vascular anomalies.
Epithelioid hemangioma (EH) was proposed as a distinct clinical finding in 1969, manifesting, clinically, as benign subcutaneous lesions . These tumors are histologically defined by capillary vessel proliferation with eosinophilic infiltration and lymphoreticular hyperplasia, typically along a blood vessel. Classic presentation consists of “hobnail” or “tombstone” like endothelial cells [1, 2]. Although EH are considered uncommon, their prevalence is challenging to accurately measure due to the difficult diagnosis of epithelioid vascular tumors and variability in the nomenclature [2, 3].
EH commonly presents as red-to-purple painless nodules with a slight propensity for young to middle-aged females [1, 4, 5]. Cases have been reported globally, particularly among Asian and Caucasian populations. While the most prevalent site is the head and neck, EH has been identified in numerous anatomic locations, such as the lower back , penis , orbit , colon , oral cavity , thigh, and ankle . Although typically a dermal or subcutaneous lesion, EH of larger vessels, heart, deep soft tissue, and bone have also been described [11,12,13,14].
There is no clear consensus on the pathogenesis of EH. Popular hypotheses include infectious and neoplastic causes, but the majority of studies support a reactive etiology [4, 5, 15]. Although debate over the cause of EH remains unresolved, surgical excision with negative margins has proven to be the treatment of choice. When completely removed, local recurrence is rare. However, with incomplete resection, 33% of patients will recur either at the same site or a distant site along the same blood vessel [4, 5, 15]. Medical treatments have been used with mixed results; these include radiotherapy, chemotherapy, cryotherapy, steroid injections, and laser treatments [16,17,18,19,20].
Here, we report an unusual presentation of EH in a 16-year-old male with the goal of clarifying the diagnosis and treatment strategies for this rare vascular anomaly by differentiating it from related conditions.
This patient is a 16-year-old male who presented with a painless, progressively enlarging mass over his left scapula. It was originally thought to represent a lipoma, and the patient underwent planned excision by an outside physician. However, during attempted excision, significant bleeding was encountered within the mass, and the procedure was aborted. A vascular lesion was suspected, and the patient was subsequently referred to the Vascular Anomalies Center in Houston, TX. His exam showed a 15 × 15cm well-circumscribed mass with firm attachment to the underlying soft tissue. There were no overlying skin changes other than a well-healed surgical scar. There had been significant growth since his attempted excision 7 months prior, which affected his ability to wear clothes and a backpack at school. Ultrasound showed a high-flow hypervascular, intramuscular mass. Magnetic resonance imaging (MRI) confirmed these findings in addition to multiple large feeding vessels (Fig. 1). He underwent core needle biopsy which showed rare spindle cells and plump endothelial cells, which was suggestive of EH.
After multidisciplinary discussion, decision was made to proceed with excision. Preoperative embolization was performed the day prior to surgical excision to decrease inflow. Wide skin excision was performed together with portions of the trapezius and the rhomboid muscles to which the mass was deeply adherent. The mass was richly vascular with large arterial and venous branches appearing to originate deep to the trapezius muscle. However, the fascia did not look involved. The lesion was removed “en bloc” and sent for pathologic examination (Fig. 2). Reconstruction of the defect consisted of muscle re-approximation and local tissue rearrangement (Fig. 3). The patient was discharged the following day without postoperative complications.
Pathology showed a lobulated, richly vascular mass with prominent epithelioid cells and positive deep margins. Vascular channels were negative for Glut-1. Immunostain for D2-40 showed a minor lymphatic component. These findings were consistent and confirmed the diagnosis of EH. He recovered well and remained free from recurrence at his 6-month postoperative follow-up appointment (Fig. 4). While the patient initially voiced concern about attending school because of the size of the mass, he was pleased with the treatment plan and postoperative outcome.
Although epithelioid hemangiomas were first described in the 1960s, inconsistencies still remain in diagnosis. EH lesions have been identified by many terms including angiolymphoid hyperplasia with eosinophilia [5, 21], intravenous atypical vascular proliferation , inflammatory angiomatous nodule , and histiocytoid hemangioma , which demonstrate the inconsistencies in nomenclature. The differential diagnosis includes benign, inflammatory conditions such as Kimura disease, IgG4-related skin disease, bacillary angiomatosis, cutaneous epithelioid angiomatous nodule, and malignant epithelial vascular tumors such as epithelioid sarcoma-like hemangioendothelioma, epithelioid hemangioendothelioma, and epithelioid angiosarcoma. Notably, Kimura disease is perhaps the most difficult to distinguish from EH. In fact, they were originally considered to be different manifestations of the same disease . Both Kimura’s disease and EH may have some overlapping features, but Kimura’s has been determined to be an allergic process, while EH lacks autoimmune features, making the unique histopathology of EH quite subtle [3, 26].
Our case represents an unusual example of EH in terms of size and degree of tissue involvement. The majority of documented EH lesions have diameters less than 3 cm, with lesions larger than 10 cm rarely seen. The mass described in this case had grown to 15 × 15 cm by the time of excision, representing one of the largest EH lesions documented in the literature. EH lesions are typically present in dermal or subcutaneous tissue; however, in this case, the lesion originated deep to the underlying muscle. Although there has been a case reported of a cavernous hemangioma between the trapezius and splenius capitis muscles , a bone EH of the scapula reported , and an EH lesion 1.8 × 1 cm presenting on the back , no such sizable EH lesions with intramuscular involvement has been reported.
Assessed by fine needle aspiration and frozen section, the tumor presented here was composed of predominantly lobulated arterial and venous channels with a minor lymphatic component. The lack of cytologic atypia, absence of necrosis, and presence of lobular architecture lessened the suspicion for a malignant mass, such as epithelioid hemangioendothelioma or epithelioid angiosarcoma. Testing for Glut-1 was negative, indicating that the lesion was unlikely an infantile hemangioma, and prominence of epithelioid endothelial cells in lobular channels helped to confirm the diagnosis of EH .
The tumor was surgically resected after confirming the final diagnosis. Pathological negative margins would have been ideal given the chance of local recurrence with incomplete excision. However, the defect would have been disfiguring and not justifiable for this benign disease process. Thus, the decision for active surveillance was elected after a long discussion with the patient and family.
The pathogenesis of EH still remains elusive, although the reactive theory has been supported in the literature. The lymphocytic infiltrate present in older EH lesions and a history of local trauma or damaged vessels lend support to this theory. One study examining 96 samples of EH lesions concluded that EH is likely reactive in nature due to a significant number of EH lesions presenting secondary to damage and repair of underlying vessels [1, 5]. However, there is reason to consider other potential etiological factors as well. An EH case connected with human immunodeficiency virus suggests the potential for an infectious or immune-related etiology . Cases have been described in which EH lesions have presented with either concurrent follicular mucinosis, peripheral T cell lymphoma, or detected T cell receptor gene mutation, suggesting a potential underlying neoplastic cause of EH [32,33,34,35]. The abnormal vessel proliferation of EH may also be derived from FOS oncogenic activation, which supports a neoplastic etiology .
Further investigation is warranted to determine the true incidence of EH worldwide. Additionally, higher quality education is necessary to differentiate between similar vascular anomalies. New tools, such as next-generation sequencing, can help remedy this diagnostic challenge by differentiating tumors based on their own specific deleterious variants. This has already shown promise in differentiating epithelioid angiosarcoma and EH . Further investigation into the potential etiologies, such as the recent connection found between EH and the FOS gene mutation, could reveal more information on the causes and risk factors associated with these lesions [36, 38].
Both across specialties and within associated disciplines, it has been shown that there is inconsistency in the terminology used to describe vascular anomalies . Obtaining an accurate diagnosis with appropriate terminology is important for properly managing patients. Heightened awareness of the variety of clinical presentations, different terminologies, and diagnostic tools is essential to improving patients’ prognoses for all vascular anomalies.
Epithelioid hemangiomas are benign vascular tumors that are rarely observed within the pediatric population. Furthermore, discerning its prevalence is difficult due to the challenging nature of diagnosing vascular tumors and the similarities between these vascular anomalies. Diagnosis is generally suspected via ultrasound and MRI and confirmed by biopsy. For large EH that are deeply adherent to muscle, we found that treatment with preoperative embolization followed by excision provided excellent postoperative results with minimal morbidity.
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Wiggins, C.J., Dibbs, R.P., Bartlett, E.L. et al. Atypical presentation and management of an epithelioid hemangioma: a case report and review of the literature. Ann Pediatr Surg 16, 53 (2020). https://doi.org/10.1186/s43159-020-00064-6
- Epithelioid hemangioma
- Vascular neoplasm