Serous borderline ovarian tumors (SBOT) generally occur in young women, present at early stages and are associated with an excellent prognosis. However, there are rare subtypes of SBOT which may exhibit a more aggressive course. In contrast with other types of SBOT, the micropapillary variant SBOT (SBOT-MP) tends to present at advanced stages. Herein, we present a rare case of a SBOT-MP that oc...

We report a case of liver metastasis of lung carcinoma with portal vein tumor thrombus (PVTT). Although the primary lesion of lung tumor remained unchanged, the patient rapidly developed wide-spread metastases and formed PVTT of liver metastasis. The primary lesion showed features of mixed Clara and bronchial surface epithelial cell component type adenocarcinoma with small foci of micropapillar...

Micropapillary variant of urothelial carcinoma (MPUC) is an uncommon variant of urothelial carcinoma with high metastatic potential. The cases reported in the literature were associated with high grade and advanced stages of the disease at presentation and had a poor prognosis. Four patients were diagnosed with MPUC at our center. One patient had an MPUC located in the urinary bladder, and the ...

We diagnosed a non-small cell lung carcinoma in a 49-year-old female patient with the histopathological diagnosis of stage IIIB mixed bronchioloalveolar and papillary adenocarcinoma with extensive micropapillary feature, which was not visualized on the preoperative multimodality imaging with positron emission tomography (PET) and computed tomography (CT). The micropapillary component characteri...

Adenosquamous lung carcinoma (AdSqLC) has a worse prognosis than adenocarcinoma (ADC) or squamous cell carcinoma (SQCC). Micropapillary pattern in lung ADC is an additional poor prognostic factor. We describe a rare case of AdSqLC with epidermal growth factor receptor (EGFR) mutation in both the micropapillary-ADC and SQCC components, showing long-term response to gefitinib. A 60-year-old woman...

An extremely rare case of stromal micropapillary predominant lung adenocarcinoma is presented in this study. A 70-year-old woman visited our hospital because of an abnormal shadow on chest X-ray. Chest computed tomography revealed a nodule in the left lower lobe and a mass in the left upper lobe. She underwent an exploratory thoracotomy owing to the suspicion of advanced lung cancer. Pathologic...

Invasive micropapillary carcinoma (IMPC) is defined as a carcinoma composed of small clusters of tumor cells lying within clear spaces which simulate lymphovascular channels. This histologic pattern has been described in various organs, including the breast, lung, urinary bladder, ovary, stomach, pancreas, and major salivary glands. Although rarely observed as a pure histologic component, IMPC ...

Mucinous lesions of the breast represent a broad spectrum of entities, which may pose a diagnostic challenge on fine-needle aspiration cytology. Mucinous carcinomas are so bland cytologically that they may be misdiagnosed as benign lesions, especially in cellpoor samples with ample mucin [1]. Assessment of cytologic details in conjunction with the radiological and clinical findings leads to a m...

The hobnail variant of papillary thyroid carcinoma (PTC) is a rare, aggressive variant in which > 30% of the tumor cells have hobnail features. The clinical behavior and pathologic characteristics of these tumors are still unclear due to the rarity of the entity. The present study aimed to investigate cytologic, clinical, pathological, and molecular features of the hobnail variant from our data...