Makoto Hyuga

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.

A case of angiosarcoma of the nasal cavity successfully treated with recombinant interleukin-2.

Angiosarcomas very rarely arise in the nose and paranasal sinuses, with an incidence of about 4%. To our knowledge, there have been only 4 reported cases in the literature. This paper reports a case of angiosarcoma arising in the nasal cavity that decreased in size after the administration of recombinant interleukin-2 (rIL-2), with a brief review of the literature. A 55-year-old male with a chief complaint of frequent epistaxis on the left side was referred to our department for close examination on January 21, 2000. His past and family histories were unremarkable. No abnormal findings were noted in the ear, pharynx, larynx, or neck. Examination of blood coagulation was normal. Enhanced CT showed a mass lesion with an enhancement effect in the left nasal cavity. T1-weighted images of MRI also demonstrated an enhanced tumor in the left nasal cavity (Fig 1a). After septal correction surgery on April 20, 2000, a dark red tumor was found in the left nasal cavity. A biopsy specimen was taken during surgery. Pathological examination of HE-stained sections showed proliferation and irregular arrangement of vascular endothelial cells (Fig 1b and c). Immunohistochemical analyses using CD34 showed a specifically positive staining corresponding to vascular endothelial cells. We concluded that the nasal tumor was angiosarcoma. Angiography of the left carotid artery was performed on May 8, 2000. The tumor was supplied by both the anterior ethmoid artery, a branch of the internal carotid artery, and the greater palatine artery, a branch of the external carotid

The localization of motoneurons innervating the canine pharyngeal constrictor muscles in the posterior larynx by the fluorescent double-labeling technique

SummaryThe localization of motoneurons innervating the canine pharyngeal constrictor muscles in the posterior larynx, i.e., the hyopharyngeal muscle (HP), the thyropharyngeal muscle (TP) and the cricopharyngeal muscle (CP), was investigated by the fluorescent labeling technique. Labeled cells were found in the rostral portion of the ipsilateral nucleus ambiguus. The rostral ends of these cell columns were located at nearly the same level. The caudal ends of the HP cell column and the TP cell column were also located at nearly the same level. However, the CP cell column was elongated a little more caudally. The HP cells and the TP cells were intermingled in the dorsal part of the nucleus. The CP cells were mainly located in the ventral part of the nucleus. No double-labeled cells were detected.