Although PDTC has considerable cytomorphological overlap with well-differentiated thyroid tumours, this present study highlights certain cytomorphological features that may suggest the correct pre-operative diagnosis, important for the appropriate management.

The knowledge of cytological features may aid in diagnosing this rare tumour correctly on FNA smears, thus enabling correct patient management.

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Cytology plays an important role in the diagnosis of GB-NETs for appropriate subtype characterization, which is necessary for the prognostication of these tumours. TTF-1 may not be used for the differentiation of gallbladder SCCs from pulmonary SCCs.

Background:Neoplastic meningitis (NM) is a condition characterized by leptomeningeal involvement by metastatic carcinoma. Detection of exfoliated malignant cells in cerebrospinal fluid (CSF) due to meningeal metastasis is frequently associated with diverse neurologic presentations.Materials and Methods:In this retrospective study of all cases of NM diagnosed in CSF samples over a 20-year period at a tertiary care referral center, the cytomorphologic features were reviewed.Results:Sixty six cases of NM were identified of which 36 already had an established diagnosis of malignancy while in 30 patients, there was no previously known tumor. The most common known primary in the former group was breast followed by ovary. Single cell pattern, cellular cannibalism, moderate cytoplasm and rounded nuclei were seen in breast and lung tumors. Papillary architecture and cytoplasmic vacuolation were seen in the ovarian primaries. Melanin pigment was seen in malignant melanoma.Conclusion:CSF cytology is an important tool for diagnosis of NM. Cytomorphologic features helped in diagnosis and for prediction of the primary site. Correct identification of this condition is important as it has therapeutic and prognostic implications.