HER2-positive mucinous cystadenocarcinoma of the breast coexisting with invasive lobular carcinoma: A case report and review of the literature.

Primary mucinous cystadenocarcinoma (MCA) of the breast is a rare variant of breast carcinoma. A 68-year-old female patient presented to the general surgery clinic with pain and swelling in the right breast. A mass was detected in the upper outer quadrant, and a fine-needle aspiration biopsy was performed. The May-Grünwald Giemsa stained slides showed aggregates of mucin-rich pleomorphic cells with large nuclei in a mucinous background containing discohesive single cells. The Papanicolaou stain revealed a papillary structure composed of malignant epithelial cells in a necrotic background. A modified radical mastectomy was performed, and upon gross examination, two tumors were discovered in the central and upper outer quadrants. The first tumor, located centrally, was identified as invasive lobular breast carcinoma. The second tumor was an MCA with cytokeratin 7(+) and cytokeratin 20(-), and was determined to be the primary MCA of the breast based on clinical and radiological information. Immunohistochemistry revealed that the tumor cells were negative for estrogen receptor and progesterone receptor, and HER2 was 2+. Fluorescence in situ hybridization analysis detected HER2 gene amplification. During the 72-month follow-up, there were no findings compatible with recurrence or new metastasis. Although primary MCA is rare, it causes differential diagnosis problems and has different biological behaviors.

The effectiveness of the liquid-based preparation method in cerebrospinal fluid cytology.

OBJECTIVES: Since malignant cells were first detected in the cerebrospinal fluid (CSF), numerous methods have been used for CSF examination. The cytocentrifugation and liquid-based cytology (LBC) methods are two of these. We aimed to investigate whether the results from the LBC method were different from the results of the cytological diagnosis of the CSF materials that were prepared using the cytocentrifugation method. MATERIALS AND METHODS: A retrospective analysis was conducted using the pathological records of 3,491 (cytocentrifugation on 1,306 and LBC on 2,185) cytological specimens of CSF which were diagnosed over a 4-year period between January 2007 and December 2011. The Fisher exact test was used to compare the results of the LBC and cytocentrifugation methods. RESULTS: While there was a noticeable decrease in nondiagnostic diagnosis and a slight decrease in suspicious diagnosis, there was an increase in malignant and benign diagnosis with the LBC method in comparison to the centrifugation method. Statistically, the decrease in nondiagnostic diagnosis was considered significant (p < 0.0001). DISCUSSION: The LBC method seems like a better option than the cytocentrifugation method, because of many preparatory, screening and diagnostic advantages, especially in pathology departments where materials come from far away and large volumes are examined.

Mixed odontogenic tumor: ameloblastoma and calcifying epithelial odontogenic tumor.

Odontogenic tumors constitute a group of heterogeneous disease derived from epithelial, mesenchymal and/or ectomesenchymal elements. Ameloblastoma is the best known and the most frequent form of odontogenic tumors. Calcifying epithelial odontogenic tumor (CEOT), known as Pindborg tumor, is locally invasive lesion which has a characteristic amiloid deposition. Here a case of a peripheral ameloblastoma associated with CEOT is presented with clinical and morphological features.

Microcystic urothelial carcinoma of the urinary bladder metastatic to the penis.

Metastatic spread of primary bladder cancer to the penis is an extremely rare event. Microcystic urothelial carcinoma is a very rare variant of urothelial carcinoma. Due to its rareness and insufficient clinical follow-up data, the prognosis of microcystic urothelial carcinoma is still not clear. Here in we report a case of a penile metastasis from microcystic urothelial carcinoma of urinary bladder, in a 56-year-old man who died 6 months after radical cystoprostatectomy and total penectomy. To the best of our knowledge this is the first case report of microcystic variant of urothelial carcinoma which has metastasized to the penis.