Cytological diagnosis of osteosarcoma with emphasis on diagnostic pitfalls.

INTRODUCTION: Fine needle aspiration is a well-established technique for evaluating primary and secondary bony lesions. With use in selected cases, it achieves a diagnostic yield comparable to biopsies. METHODS: Cases of osteosarcoma (OS) with available histological follow-up were retrieved over a 10-year period. Detailed morphological evaluation was done, with special emphasis on pitfalls in the diagnosis of OS on cytology and the various variants of OS. RESULTS: Of the 41 cases with available follow-up histology, 56% were correctly diagnosed as OS on cytology. The most common false-negative cytological diagnosis of OS, in 17% cases, was giant cell tumour. The possible explanations for this included low cellularity, minimal atypia, absence of typical osteoid, misinterpretation of metachromatic osteoid material as fibro-collagenous material and non-availability of radiology at time of aspiration. CONCLUSION: A triple-phase evaluation including clinical evaluation, appropriate radiological correlation and cytology/histopathology, is important to clinch an accurate diagnosis.

Evanescence of Endometrial Carcinomas in Hysterectomy Specimens: Observations on the "Vanishing Cancer" Phenomenon.

BACKGROUND: The phenomenon of vanishing carcinomas, first described in context of prostatic carcinomas, has been documented in endometrial carcinomas as well. METHODS: The archives of the department were searched for case files of endometrial carcinoma diagnosed on endometrial curetting/biopsy but which did not reveal any cancer on the subsequent hysterectomy specimen. Clinical and pathological correlation was established. RESULTS: A total of 5 cases were retrieved with biopsy-diagnosed endometrial carcinomas, 4 endometrioid and 1 serous type, which on subsequent hysterectomies did not reveal any tumor. These 5 cases represented 1.56% of total hysterectomies in our series. All were Stage Ia tumors, which on follow-up (mean = 18.2 months) did not show any local reoccurrence. Adjuvant therapy was instituted in 1 case in the form of pelvic irradiation in view of the serous histology. In all cases, the primary diagnosis was reconfirmed and any remote possibility of incorrect patient identification, laboratory errors, and institution of hormonal therapy were adequately ruled out along with an extensive endometrial sampling in hysterectomy. CONCLUSION: The recognition of "vanishing endometrial carcinoma" as a distinct entity is of utmost importance to avoid mislabeling them as medical errors.

A Plasma Cell Myeloma With Post-Therapy Anaplastic Morphology, Osteomyelosclerosis, and Strong Pan-Cytokeratin (AE1/AE3) Expression: A Potential Diagnostic Pitfall.

Reactive and neoplastic plasma cells can display considerable morphological anaplasia as well as variable immunoreactivity for epithelial markers including epithelial membrane antigen, pan-cytokeratin (panCK) and high-molecular-weight cytokeratin, potentially creating diagnostic dilemmas. We describe the case of a 51-year-old male, previously treated for IgGλ plasma cell myeloma, whose bone marrow biopsy showed focal replacement by sheets of pleomorphic malignant cells and grade 3 myelofibrosis, raising the morphological possibility of a carcinomatous infiltration. First-line immunohistochemistry revealed strong panCK as well as CD138 positivity. However, subsequent MUM-1 and CD38 stains were also positive, clinching the diagnosis of relapsed plasma cell myeloma with anaplastic morphology and aberrant strong cytokeratin expression. The case warns of the perils of using limited immunohistochemical panels in poorly differentiated metastatic neoplasms and the importance of providing a complete clinical background to the reporting pathologist.

Tuberculosis in Pap samples with emphasis on LBC: Caught only when thought.

Despite being a commonly encountered infection, the clinical diagnosis of tuberculosis of the uterine cervix is elusive. Though a straightforward diagnosis on tissue sections, identification of typical features of tubercular infection on cervical Pap samples is challenging. In our experience, the infrequent pale staining collections of epithelioid cells are difficult to pick up on Pap stained smears, particularly LBC samples. In this series, 2 of the three samples were reported as atypical squamous cells of undetermined significance while 1 was reported as inflammatory at the initial diagnosis. Scattered Langhans' type giant cells may be seen as a subtle clue which should prompt the search for epithelioid cell granulomas. These cases may have a mass lesion clinically while no obvious signs of malignancy on the cervical samples.

Congenital Hepatic Fibrosis with Polycystic Kidney Disease: An Unusual Cause of Neonatal Cholestasis.

Congenital hepatic fibrosis is characterized by hepatic fibrosis, portal hypertension, and renal cystic disease. Typical presentation of congenital hepatic fibrosis is in the form of portal hypertension, in adolescents and young adults. We present an unusual case of neonatal cholestasis with rapid deterioration within first 4 months of life, who was diagnosed to have congenital hepatic fibrosis with polycystic kidney disease on autopsy.

Evaluation of gamma glutamyl transferase as a marker of cardiovascular risk, in 200 angiographically proven coronary artery disease patients.

Gamma glutamyl transferase (GGT) is emerging as a promising marker for assessing cardiovascular risk. GGT predicts cardiovascular mortality in the population and is positively associated with traditional risk factors for coronary artery disease (CAD). This study was undertaken on 200 north Indian CAD patients diagnosed with coronary angiography to study relation of GGT with risk factors for CAD and severity of CAD. GGT values ranged from 5 to 69U/L and were divided in 4 quartiles. GGT was positively associated with triglyceride (p=0.008) and VLDL cholesterol (p=0.002) in our subjects. Also an increase in total cholesterol from GGT quartile I to quartile IV (p=0.28) was noted.

Significance of flower pot cells in effusion cytology.

Cells with long polar hair-like processes referred to as 'flower pot cells' are a rare but beautiful morphological feature observed in effusions of diverse etiologies. This report describes these cells in effusions seen in ovarian borderline serous tumours, malignant mesothelioma and in reactive mesothelial cells with or without accompanying malignant cells. These processes were better appreciated in air-dried May-Grunwald-Giemsa stained smears.

Fine-needle aspiration cytology in primary cutaneous tumors.

BACKGROUND: Fine-needle aspiration biopsy (FNAB) is occasionally used in the evaluation of primary skin tumors. However, in routine evaluation of any soft tissue swelling we encounter the cases of skin lesions. It is essential to know FNAB features of skin lesions. MATERIALS AND METHODS: We present detailed cytomorphologic features with histologic correlation of 28 primary skin tumors, evaluated over a period of 4 years. RESULT: An accurate diagnosis was provided in 42.8% cases, while benign or malignant nature was correctly established in 82.1% cases. CONCLUSIONS: The most common cause of incorrect diagnosis was sampling error and a definitive diagnosis was not provided in adnexal tumors due to overlap of cytologic features and lack of availability of architectural features. The knowledge of cytological features of the skin adnexal tumor is helpful to avoid any mistaken diagnosis. Diagn. Cytopathol. 2017;45:681-688. © 2017 Wiley Periodicals, Inc.