Quiz regarding the cytological analysis of peritoneal effusion in a patient with a history of myeloproliferative neoplasm.

The interventional cytopathologist can successfully refine the differential diagnosis of a neck mass by combining ultrasonographical and morphological skills as shown in this case of head and neck paraganglioma, which was suspected thanks to ultrasound features and rapid-on site evaluation and further confirmed by immunocytochemistry on cell block and by the subsequent histologic evaluation.

This manuscript presents an unusual case of metastatic poorly differentiated prostate adenocarcinoma to Virchow's node.

The aim of this observation is to make cytologists aware of the identification of melanoma cells in bronchial washings from an endobronchial metastasis of malignant melanoma. CT scan and flexible bronchoscopy images are provided and differential diagnosis and additional analyses (molecular biology) are mentioned and discussed.

FNAC from tongue is not rare and one has to be aware of the different benign and malignant lesions that can be encountered in this region. Careful observation of gross morphology along with cellular & background details will clinch the correct diagnosis.

Malignant mesothelioma (MM) is a recognised neoplasm which can be diffuse or can rarely present as a localised mass. Cytological diagnosis is a challenge and three morphological subtypes—epithelioid, sarcomatoid, and biphasic—are recognised. Rarely MM can present as a gastric mass with diffuse peritoneal spread and ascites, posing a diagnostic dilemma. Cell block and immunohistochemical stains are critical for establishing the diagnosis by fine needle aspiration cytology (FNAC).

Nasal cytology is a diagnostic tool that evaluates the normal and pathological aspects of the nasal mucosa, by identifying and counting the cell types and their morphology. Since the cytological characteristics of the infiltrating inflammatory cells could reflect any cytopathological alterations of the blood circulating cells, it is not surprising that pathological findings of patients affected by oncohaematological diseases could also be found in nasal cytology. Therefore, this diagnostic tool could be applied to other branches of medicine including haematology.

This is a rare cytopathological case of epithelioid sarcoma.

Vesicouterine fistulae (VUF) are uncommonly occurring pathological passages between the bladder and uterus, and usually occur incidental to cesarean sections. This submission presents a case of VUF that was uniquely diagnosed via immunohistochemical analysis, in contrast to traditional methods of diagnosis, including via cystoscopy or via filling the bladder with dye.

The article describes the cytomorphology of an uncommon skin adnexal tumour. Correlation of the features with histopathological features is provided and the differential diagnoses are discussed.

This article describes the cytological morphology of angiosarcoma in a pleural effusion with immunocytochemistry applied to smears to help in the diagnosis of the case.

Cytodiagnosis of a rare undifferentiated neoplasm of unknown histogenesis with red needle-shaped crystals mimicking Auer rods is presented with histological features and differential diagnosis described.