Granular cell tumor of the vulva: six new cases

Granular cell tumor of the vulva: Case report and systematic review of the literature

RATIONALE

Granular cell tumor (GCT) of the vulva is an exceptionally rare female genital tract tumor. The majority of these are benign and there are no standardized surgical techniques for the special site to reduce tension of the wound.

PATIENT CONCERNS

A 47-years-old Chinese woman experienced a nodule on her right vulva with itch sometimes in late 2018.

DIAGNOSES

Magnetic resonance imaging showed a high possibility of vulvar cancer. While Chest X-ray, abdominal sonography, and cystoscopy examination were unremarkable.

INTERVENTIONS

The patient underwent local complete resection of vulvar tumor under general anesthesia on March 24, 2022. The resection scope was approximately 4 cm × 3 cm × 3 cm. Due to the large surgical incision, Z-plasty was performed to achieve the primary closure for decreasing wound tension and improving aesthetic reduction.

OUTCOMES

The final pathological diagnosis was benign GCT of the vulva and surgical margins were uninvolved. At 8 months follow-up, no new lesions were detected.

LESSONS

Surgery with negative resection margins is the mainstay for benign GCT of the vulva, while Z-plasty is appropriate for decreasing the tension of the wound and improving aesthetic reduction.

Vulvar granular cell tumor (ABRIKOSSOFF TUMOR); a tumor of vulva which is rare but needs care

•Abrikossoff tumor is a rare tumor but not always benign.•Re-excission for positive margins in benign tumors may not be invariably necessary.•Cosmetic issues may play role in the treatment and follow-up in benign tumors.

Granular cell tumor a study of 42 cases and systemic review of the literature

BACKGROUND

Granular cell tumor (GCT) remains a diagnostic clinicopathologic problem because the exact frequency of its detailed morphological and clinical characteristics is unknown as most observations are collected from small series or isolated cases. Herein, our aim is to highlight the frequency of all clinicopathological characteristics of this rare tumor based in our series and the available medical (PubMed) literature.

MATERIAL AND METHODS

42 cases were evaluated for: tissue layers involved by the tumor (in skin and mucosae), growth pattern, nuclear pleomorphism, mitotic index, necrosis, spindling, calcification, hyalinization, and pustule-ovoid bodies of Milian, as well as perineural and vascular invasion, and the presence of adjacent epithelium changes, and lymphocytes and eosinophils infiltration., Follow-up was analyzed. The tumors were subclassified into benign, atypical and malignant according to Fanburg-Smith criteria and into benign or GCT of uncertain malignant potential according to Nasser criteria. The same characteristics were analyzed for 1499 cases reviewed according to PRISMA guidelines.

RESULTS

In the current series, the mean age at diagnosis was 45.8 years (range 6-69 years). Most patients were females (60 %) and the involved organs were by descending frequency: skin and subcutaneous tissue, bronchus, esophagus, breast, tongue, larynx, pharynx, gingiva, trachea, right colon, vulva, and hypopharynx. No recurrence or progression was seen, despite 32 cases were incompletely excised, with the exception of one malignant tumor. The growth pattern was either infiltrative (85.71 %) or well limited (7.14 %). Sixteen tumors had vesicular nuclei. Mitotic activity was found in two tumors. Lymphocytic infiltration was found in 14 tumors. Eosinophils were present in 6 cases. One GCT of the right colon showed extensive calcification and hyalinization. Perineural invasion was noted in 6 lesions. No vascular invasion was found. One tumor was clinically malignant and the patient died 2 years after diagnosis. Medical literature review showed similar results in terms of frequency of the reported clinical and morphological features. Among cases with available follow up, almost 20 % showed positive margins and of those 20 % developed local recurrence. According to the Fanburg-Smith criteria, 72 % would be benign, 17 % atypical and 11 % malignant tumors, while according to those of Nasser, 93 % would be benign and 7% of uncertain malignant potential. However, true malignancy, as affirmed by metastasis of GCT is found in almost 2.5 % of the cases.

CONCLUSION

GCT is a usually benign tumor, affecting any anatomic location. Necrosis and mitotic activity seem to be the most effective histologic criteria for detecting aggressive tumors, but the presence of metastasis (2.5 % of the cases) remains the most accepted definitive criterion for diagnosis of malignant GCT.

Granular Cell Tumor over the Mons Pubis: An Uncommon Tumor

Granular cell tumors are uncommon, usually benign, soft tissue neoplasms of neural origin. They occur throughout the body; vulval involvement is uncommon and labium majus is the commonest site in vulva. Complete surgical excision is the preferred treatment of choice to prevent recurrence. Here, we present a benign granular cell tumor over the mons pubis of vulva in a 27-year-old woman.

A Case of Granular Cell Tumor of the Clitoris in a Postmenopausal Woman

Granular cell tumor (GCT) is a rare soft tissue tumor that derived from Schwann cells. Most are benign, less than 2% are malignant and, in the malignant cases, the prognosis of survival is poor. Most of these tumors are less than 3 cm in size, and they are more common in black women. The disease usually occurs in the 40s to the 60s and occurs after menopause, but there are few cases reported in adolescence. A 45-year-old woman visited the outpatient clinic with a solid mass that developed 2 years ago and present to date on the left side of the clitoris. After complete resection, pathologic examination proved to be a granular cell. The patient has been living without recurrence for one year. We report the first case of the GCT of the clitoris in postmenopausal woman in Korea with a brief review of the literature.

Granular Cell Tumors on Unusual Anatomic Locations

Granular cell tumors (GCTs) are soft tissue tumors, which are thought to be derived from Schwann cells. Although most GCTs are reported to arise in tongue and oral cavity (30-50%), they can appear on any anatomic sites, even visceral organs. Herein, we report 5 cases of GCTs on unusual anatomic locations, such as palm, arm, thigh, finger, and vulvar area. Complete surgical excision is preferred treatment of choice to prevent recurrence. These cases emphasize that GCTs not involving oral cavity are more prevalent than expected, and the diagnosis should be histopathologically confirmed.

Case for diagnosis. Granular cell tumor

Granular cell tumor is a rare benign neoplasm of neural origin. We report the case of a female patient, 27 years old presenting a brown-red nodule in the right arm, which pathological examination showed to be formed by polygonal cells with eosinophilic granular cytoplasm and immunohistochemistry positive for S100 protein and CD68. Granular cell tumor is usually solitary and in half the cases located in the head and neck areas, 30% of these in the tongue. It is most frequent between the third and fifth decades of life in women and people of African-American ethnicity. Its origination is controversial, including the possible origins in muscle, fibroblasts, neural crest, neural sheath or histiocytes. The positivity for S-100 and CD68 suggest the neural origin.

Vulvar granular cell tumor

Granular cell tumors are rare, usually benign, soft tissue neoplasms of neural origin. They occur more often in females than males, the peak age incidence is in the fourth through fifth decades. They can occur anywhere in the body with up to 15% situated in the vulva. The commonest presentation is as an asymptomatic mass. Microscopic findings are usually sufficient, but immunohistochemistry can also be helpful in confirming the diagnosis. The vulvar tumors are benign in 98% of cases with 2% reported as malignant. In this case report we describe a woman with a granular cell tumor confirmed by biopsy who underwent excision of the mass but with focal extension to the resection margin on microscopy. Our recommendation of re-excision was declined. Since it is not uncommon with these tumors to find groups of tumor cells extending beyond the macroscopic limits of growth, we conclude that it is advisable to have margins assessed intraoperatively by frozen section such that further excision can be performed for positive margins. Our patient has been followed for 18 mo without recurrence, should the tumor recur, re-excision, with frozen section control, is indicated. Recurrence rates are reported as 2%-8% with clear margins and 20% with positive margins.

Benign granular cell tumor of the vulva: first report of multiple cases in a family

Granular cell tumors (GCTs) are uncommon soft tissue tumors of neural derivation, as supported by immunohistochemical and ultrastructural evidence. Vulvar involvement has been reported in 7-16%. This paper presents the cases of a 60-year-old woman and her 32-year-old niece with a strong family history of cancer, both presenting with an enlarging mass on their left labia majora. The lesions were treated by simple surgical excision. Histopathological examination revealed a benign vulvar GCT in both lesions. This is the first reported case of GCT of the vulva in the same family. The possible familial component of GCT needs further investigation. A systematic review of the literature on vulvar GCTs is carried out, the most complete one to date. This review unexpectedly reveals that there have been more than 130 cases of GCT of the vulva reported to date, only 7 of which were malignant. Since 5-25% of patients have multiple lesions, before planning treatment, clinicians should exclude multicentric lesions. After surgical treatment, if there is any evidence of tumor in the surgical margin, wider local excision should be performed. Regular follow-up is important for diagnosing a possible recurrence or a new lesion.

Granular cell tumor from a 7-year swelling of the vulva: a case report

Granular cell tumor (GCT) is a rare neoplastic process of the skin and soft tissue. About 10% of GCTs are found in the vulva. A 27-year-old client presented to the outpatient service of our hospital with painless edematous lesions on both sides of labia majora and minora. After a thorough preoperative preparation, the patient underwent complete excision of the mass under general anesthesia. Pathologic examination and immunohistochemical study supported the diagnosis of GCT.

Enterobious vermicularis (pinworm) infestation of the vulva: report of 2 cases of a pseudoneoplastic lesion mimicking squamous carcinoma

Enterobious Vermicularis (pinworm) infestation outside the gastrointestinal tract is rare. We report 2 patients with vulval involvement, one of whom presented with a clinically suspicious, rapidly growing mass. The histology of both lesions showed similar features of epidermal proliferation in the form of hyperkeratosis, acanthosis, and papillomatosis; this pseudoepitheliomatous hyperplasia raised the possibility of a well-differentiated squamous carcinoma. There was associated inflammation in both cases, including large numbers of eosinophils in 1 case. On the surface or within the keratin layer, structures with the morphology of enterobious vermicularis eggs were identified. In reporting this unusual pseudoneoplastic phenomenon, we stress the necessity for the pathologist to consider and look for parasites in proliferative squamous lesions of the vulva, especially when there is an associated inflammatory infiltrate rich in eosinophils.

Isolated and synchronous vulvar granular cell tumors: a clinicopathologic study of 17 cases in 13 patients

Granular cell tumors (GCTs) are benign Schwann cell-derived neoplasms occurring throughout the body. Vulvar GCTs are usually isolated, but occasionally multifocal. On account of their anatomic location, surgical interventions aiming for negative resection margins can result in significant morbidity. We describe the clinicopathologic features of 17 vulvar GCTs in 13 patients followed for an average of 7 years. The average age at presentation was 46 years, and 84% of the patients were black. The tumors were multifocal in 3 (23%) patients, and all, either at presentation or subsequently also developed extravulvar foci. Patients with multifocal vulvar GCTs were nearly 10 years younger at presentation than patients in whom the disease was isolated. The most common complaint was a slow-enlarging mass occasionally associated with pruritus or overlying hyperpigmentation. Clinically, the tumors were subcutaneous, mobile, and nodular (2.1 cm on average), without overlying ulceration, and most often were found in the labia majora (6/17). The neoplasms were histologically heterogeneous, but exhibited either a predominantly nodular (3/17) or infiltrative (13/17) pattern of invasion. Cytologically, the tumors displayed round to polygonal cells with a granular cytoplasm, small hyperchromatic nuclei with minimal pleomorphism, and less than 2 mitoses per 10 high power fields. One tumor (1/17) consisted of cells with predominantly vesicular nuclei and prominent nucleoli and was classified as an atypical vulvar GCT. All tumors so examined were reactive for S-100 protein. Eight of 17 tumor excision specimens had positive margins. Of these, 5 tumors remained stable whereas the other 2 with follow-up progressed to require reexcisions after periods of 14 and 8.0 years, respectively. All patients with excisions with negative margins remained stable. Patients with multifocal tumors did not have a higher risk of recurrence per tumor, compared with patients with isolated disease, regardless of the margin status. No patient died from her disease. As granular cell neoplasms have such a low risk or recurrence and behave generally in an indolent manner, aggressive therapy is usually unwarranted.

Granular cell tumor of the urinary bladder

A 67-year-old Korean man presented with gross, painless hematuria that had lasted for the previous 2 months. Cystoscopy showed a semispherical tumor approximately 1 cm in diameter that was covered with normal bladder mucosa and extended from the bladder neck to the posterior wall of the bladder. The patient underwent transurethral resection of the tumor. Histological examination and immunohistochemical staining showed a granular cell tumor (GCT). There were no features suggesting a malignant phenotype. On follow-up, the patient has remained free of bladder recurrence. We herein report this case of a GCT of the urinary bladder and review the literature.

Granular Cell Tumor in the Testis of a Rabbit: Cytologic, Histologic, Immunohistochemical, and Electron Microscopic Characterization

An adult pet rabbit ( Oryctolagus cuniculus) presented with a progressively enlarging left testicle. Because neoplasia was suspected, the testicle was removed. Pathologic evaluation (exfoliative cytology, histopathology, immunohistochemistry, electron microscopy) indicated that the tumor was an intratesticular granular cell tumor. Granular cell tumor has not been described in rabbits before and has not been described in the testes of animals or postnatal humans. Granular cell tumor should be included as a differential diagnosis of testicular tumors, particularly Leydig cell tumor, because of potential histologic similarities.