BACKGROUND Pigmentary problems are one of the most frequent causes for dermatologic consultation. Skin colour is highly individual and the variations are controlled by numerous genes. Correct diagnosis of skin disorders including pigmented lesions depends on histopathologic examination of skin biopsies and clinicopathologic correlation. METHODS This is a hospital based observational study done for a period of 2 years from July 2017 to June 2019 with a sample size of 88 cases in the Department of Pathology, Andhra Medical College, Visakhapatnam. Specimens were formalin fixed and the tissue was adequately processed for histopathological examination. The sections were stained routinely with haematoxylin and eosin and examined under light microscopy. RESULTS Out of the 88 cases, 30 cases were inflammatory lesions which include 14 cases of classic lichen planus, 6 cases of lichen planus hypertrophicus, 9 cases of lichen planus pigmentosus and 1 case of lichenoid keratosis. 35 cases were benign lesions comprising 21 cases of benign melanocytic nevi and 14 cases of seborrheic keratosis. 23 malignant lesions include 16 cases of basal cell carcinoma and 7 cases of melanoma. Most common affected age group was 51-60 yrs. Most common site involved in malignant lesions was face (34.33%). There is slight female preponderance. Most common pigmented lesion under malignant category was basal cell carcinoma about 16 cases. 75 cases (85%) were correlated clinically. CONCLUSIONS Classic Lichen planus is the most common lesion seen under inflammatory category. The diagnosis of seborrheic keratosis is mainly based on the histopathological examination in order to differentiate from other pigmented skin lesions, hence a careful histopathological diagnosis is important.

BACKGROUND A variety of non - neoplastic and neoplastic conditions involve the nasal cavity, paranasal sinuses and nasopharynx and these are very common lesions encountered in clinical practice. Histopathological examination of these lesions is the gold standard for diagnosis because management and prognosis vary among different lesions. The aim of the present study was to evaluate the histopathological study of the lesions of the nasal cavity, paranasal sinuses and nasopharynx in relation to their incidence, age, gender and site wise distribution and to compare the results with the available data. METHODS A study of 88 cases was conducted for a period of 2 years from August 2017 to July 2019. After fixation, Processing and Haematoxylin and Eosin staining and special stains histopathological diagnosis was made. RESULTS Among 88 total cases, 58 were males and 30 were females. A male predominance was observed with a male to female ratio of 1.93 : 1. They were more common in third, fourth and fifth decade of life. Malignant nasal lesions were seen after fourth decade of life. Nasal lesions were more common in nasal cavity (67.05 %), followed by paranasal sinuses (18.18 %) and nasopharynx (14.75). Out of 88 total cases, 39 (44.32 %) were non - neoplastic, 30 (34.09 %) were benign and 19 (21.59 %) were malignant nasal lesions. CONCLUSIONS Sinonasal lesions and nasopharyngeal lesions can have various differential diagnoses. A complete clinical, radiological and histopathological correlation helps to categorize these sinonasal lesions into various non - neoplastic and neoplastic types. But histopathological examination remains the mainstay of definitive diagnosis. KEYWORDS Nasal Cavity, Paranasal Sinuses, Nasopharynx, Benign Tumours, Malignant Tumours, Histopathological Examination