Tomio Terazono

Fibrolipoma of the parotid in a child

Fibrolipoma is a rare benign tumor found predominantly in middle and later life; it is very uncommon in children1 There are many reports in literature of resected fibrolipomas of the oral cavity.2,3 However, there are only a few reports of fibrolipoma in the parotid. This report describes a case of a S-year-old girl with fibrolipoma of the parotid gland. This is the youngest such patient to be found in the literature. lobules of yellow adipose tissue separated by white fibrous septa. No hemorrhage, necrosis, or calcification was noted. Microscopic examination of sections stained by hematoxylin and eosin showed lobules of mature adipose tissue mixed with a network of fibrous connective tissue (Fig 4). The fibrous elements contained numerous fibrocytes, suggesting the presence of mature collagen. The adipose component consisted of mature adipocytes. The histopathological features were consistent with a fibrolipoma.

Longitudinal Median Sternotomy for Extirpation of Cervical Tumors Extended to the Upper Mediastinum

The cervical tumor observed in five cases extending to the upper mediastinum was extirpated in our department by using a combination of a neck dissection and a longitudinal median sternotomy.These tumors were originated from thyroid,thymus,and cervical nerve. The longitudinal median sternotomy is a useful approach to the upper mediastinum in order to keep a good operation view,to decrease bleeding volume,and to shorten operation time. Therefore,this approach should be adapted more for the extirpation of cervical tumor which extends to the upper mediastinum and for a mediastinal dissection.

Freeze-replica observations of guinea pig middle ear muscles.

The histological characteristics of the middle ear muscles, Musculus tensor tympani and M. Stapedius, of the guinea pig were studied using freeze-fracturing technique. No gap junction was observed but the tight junction was found in the tensor tympani muscle, possibly between muscle cells. No distinct difference was found between the size distributions of the apertures and caveolae on the fracture face of the sarcolemma of the two kinds of muscles.