Ganglioneuromas is usually arising in the posterior mediastinum and the retroperitoneum, but parapharyngeal ganglioneuromas are so rare that only 11 cases have been reported in the literature. We report a case of a 26-year-old woman with a parapharyngeal ganglioneuroma. who presented with a history of a indolent right cervical mass for 24 years. Computed tomography scan suggested that the mass was located between the carotid sheath and cervical vertebrae. The mass was completely resected under general anesthesia. It was a well-circumscribed, grayish-white and fish-shaped mass, 3.9 × 1.3 × 5.2 cm in size. Histological examination gave the diagnosis of ganglioneuroma, which was also confirmed by immunohistochemical stainings for Neuron-specific enolase and S-100, which presented intensive positive expressions. Dysphagia and Horner’s symptoms improved after surgery. There was no recurrence or metastases after 12 months.

A combined hammer and attention mill was designed and fabricated. The developed hammer and attrition mill is a multipurpose machine that can be used to reduce the size of various agricultural materials. This machine focused on how to combine the three forces used in size reduction in a single machine. The machine has two chambers. The upper chamber which is the hammer mill that uses the impact force to crush the material until it is small enough to pass through the screen. The lower chamber which is the attrition mill uses shear force to fine grind the already crushed material. The machine is driven by an electric motor of 7.5kW at a speed of 1440rpm. It has an average capacity and an average throughput efficiency of 47.2kg/hr and 98.4% respectively.