Plexiform Neurofibroma: A Rare Tumor of Submandibular Salivary Gland

A 15-year-old boy presented with swelling in the submandibular region. X-ray of the swollen part showed faint radio opaque shadow. A provisional diagnosis of sialadenitis with sialolithiasis was made. Excised mass was reported histopathologically as plexiform neurofibroma of submandibular salivary gland. Plexiform neurofibroma of the salivary gland is a rare benign tumor often present in the parotid gland. It is very rare in submandibular salivary gland. It is a slow growing, locally infiltrating tumor. Key words: Plexiform neurofibroma, sialadenitis, sialolithiasis, submandibular salivary glan

Adrenal ganglioneuroma; a rare neurogenic tumor in a 25-year-old female

Ganglioneuromas (GNs) are rare benign tumors originating from the neural crest tissue. They are characteristically located in the posterior mediastinum and retroperitoneum; and are rarely found in the adrenal gland. GNs are usually hormonally inactive, and most of the cases are detected incidentally. We report a case of 25-year-old female who presented with pain abdomen in the right upper quadrant. Imaging studies showed a large well defined hypodense lesion with calcification measuring 14.5×11.5×11cm in the region of right adrenal gland and a possibility of adrenocortical carcinoma was suggested. The patient underwent right adrenalectomy and histopathological examination revealed ganglioneuroma. This report emphasizes that GN can be misdiagnosed preoperatively as the presenting symptoms are nonspecific and imaging characteristics are variable. Histopathological examination is the mainstay of diagnosis

Inferior turbinate osteoma: a case report

Osteoma is the most common benign tumor of the paranasal sinuses. Turbinate osteomas are very rare and only five middle turbinate, two inferior turbinate and one superior turbinate osteoma cases have been reported. We present a rare case of osteoma of the left inferior turbinate in a patient presented with unilateral nasal obstruction that was removed endoscopically and conduct a literature review on turbinate osteomas arising from different turbinates

Variation in viscous fingering pattern morphology due to surfactant-mediated interfacial recognition events

The study of the formation of finger-like patterns during displacement of a viscous fluid by a less viscous one is of technological importance. The morphology of the viscous-finger patterns generated is a function of many parameters such as the flow rate, difference in viscosities of the two fluids and the interfacial tension. We demonstrate herein that the morphology of patterns formed during viscous fingering in a Hele-Shaw cell during displacement of paraffin oil by aqueous solutions of the surfactant sodium dodecyl sulphate (SDS), is extremely sensitive to interfacial tension variation brought about by complexation of divalent cations with the surfactant SDS. The variation in morphology of the patterns formed has been quantified by measuring the fractal dimensions of structures formed in a radial Hele-Shaw cell as well as the average finger width in a linear Hele-Shaw cell. This technique shows promise for studying other interfacial phenomena in chemistry such as biorecognition as well as dynamic processes occurring at interfaces