The fissures of lungs are embryologically separating the bronchopulmonary segments, which later on persist in interlobar planes of fully developed lung. Fifty lungs (23 right side and 27 left side), obtained during routine dissection and preserved in formalin constituted the material for present study. In them, variations in fissures and lobes of lung were observed and compared with the previous studies. Seven right sided and 14 left sided lungs showed incomplete oblique fissure. Incomplete horizontal fissure of right lung was observed in eight lungs while it was completely missing in three specimens. A right lung with “lobe of the azygos vein” separated by a supernumerary fissure in medial surface was found. One of the right lung had both superior accessory fissure and inferior accessory fissure and four other right lungs and one left lung presented only with inferior accessory fissure. A vertical notch was found in middle lobe of one right lung. Eight left lungs exhibited with left minor fissure among them two lungs had lingula appearing as a separate lobe. Knowledge of variations in fissures and lobes is of interest to all medical professionals to exactly interpret radiographs, computed tomography scans, to diagnose, plan and modify a surgical procedure depending on the merit of the case and also in certain classical clinical cases pertaining to lung pathologies.

Thymus is bilobed primary lymphoid organ situated in superior and anterior mediastinum. The appearance of thymus varies considerably with age. It reaches maximum size at puberty and eventually undergoes “fibro fatty involution”, but it may persist actively to old age. Therefore, normal appearance and size of thymus have been elusive. Embryologically, it develops, as two separate organs from the endoderm of third pharyngeal pouches of embryo in common with inferior parathyroid glands and fuse in the midline. The study was carried on 10 embalmed cadavers of known sex in Anatomy Department of National Medical College, Birgunj, Nepal. We found a large bilobed thymus in about 65 year old male cadaver. This fact is clinically important to make differential diagnosis of radiological review in cases of mediastinal mass. A thorough knowledge of its anatomical and embryological features of the thymus, it’s normal variations, incessant in adults is necessary before doing any therapeutic, diagnostic and invasive procedures.Med Phoenix Vol.2(1) July 2017, 67-70