Adenoid cystic carcinoma of the buccal mucosa: a case report with review of literature

Unique Cytopathological Findings of a Mucinous Myoepithelioma Showing a Mucous Globule and a "Sieve-Like" Structure

Myoepitheliomas are rare salivary gland-type tumors. The tumors are divided into four histological subtypes (spindle cell, plasmacytoid, epithelioid, and clear cell) and two variants (reticular and mucinous). A myoepithelioma of the mucinous variant, also referred to as mucinous or secretory myoepithelioma, is a novel variant of myoepithelioma characterized by the presence of extracellular mucin. To date, only six benign mucinous myoepitheliomas have been reported. We herein report an 84-year-old man with a four-month history of swelling in the left bucca. Computed tomography revealed a well-demarcated elliptical mass measuring 30 mm in diameter. Fine-needle aspiration (FNA) smears showed an acellular spherical matrix surrounded by basaloid cells with scant cytoplasm resembling mucous globules, in addition to clusters of spindle cells. The mass was initially diagnosed as a pleomorphic adenoma based on the presence of a mucous globule-like structure and cytological variation. The surgically resected tumor showed two different histological components: one was composed of cells arranged in thin cords with a mucoid stroma showing a "sieve-like" structure and the other component was spindle cells. Alcian blue staining confirmed extracellular mucin in both tumor components. The tumor was suspected of being a mucinous myoepithelioma. We encountered a case of a mucinous myoepithelioma with two unique features, namely its cytological features of mucous globules composed of monotonous basaloid cells in the FNA smear and its histological feature of a "sieve-like" structure. The presence of mucous globules in FNA smears might require the inclusion of the mucinous myoepithelioma in the differential diagnosis.

Adenoid cystic carcinoma of buccal mucosa: A report of two rare cases and review of literature

In the oral cavity, adenoid cystic carcinomas of the buccal mucosa are extremely rare. Minor salivary grand adenoid cystic carcinoma should receive aggressive treatment to achieve negative surgical margins to inhibit recurrence.

A new case of the pilomatrixoma rare in the preauricular region and review of series of cases

Pilomatrixoma is considered a rare benign tumor arising from the hair follicle, most common in the head and neck region, but it is rarely diagnosed on a clinical basis. This report describes a new case of giant pilomatrixoma in a 36-year-old female patient. The nodule was localized in the preauricular area on the right side, appearing as a slow-growing, fixed, painless, with a hardened consistency, unusual giant (4.5 cm). A cone-beam computed tomography (CBCT) examination showed a slightly hyperdense lesion, and fine-needle aspiration cytology (FNAC) revealed peripheral blood and mononucleated inflammatory cells. After enucleation of lesion, a diagnosis of pilomatrixoma was confirmed. The differential diagnosis of pilomatrixoma is broad, because its characteristics also can be found in other lesions common to the head and neck. Thus, a lesion in the head and neck, adherent to the skin, and well demarcated, mainly in the young and in females, should be suspected as pilomatrixoma.

Nasopharyngeal adenoid cystic carcinoma: a case report and review of the literature

ACC derived from nasopharyngeal epithelial cells is rare, usually benign. In this article, we reported a nasopharyngeal adenoid cystic carcinoma (NACC) in a 31-year-old woman with a symptom of hoarseness, headache, epistaxis slightly, diplopia, facial numbness and dysphagia near 3 months. A tumor on the right side of the nasopharynx was confirmed by laryngoscope check and MRI of the skull base. Histopathological findings showed that tumor cells were arranged in cord-like or acinar-like by atypical hyperplastic epithelial cells forming a cribriform and tubular pattern, and immunohistochemical findings showed that tumor tissues were immunopositive for p63 (+), CK7 (+), CK19 (+), CK8 (+), CK18 (+), SMA (+), CK (+), p53 (++), S-100 (+) and Ki-67 (5%+), and negative for CD34 (-), CK5/6 (-), CEA (-) and CD117 (-). Patient was treated by surgical operation and radiotherapy, and was followed-up near 10 months, no local recurrence and distant metastasis.