International Journal of Pediatric Otorhinolaryngology, 24 (1992) 269-274 0 1992 Elsevier Science Publishers B.V. All rights reserved 0165-5876/92/$05.00

269

PEDOT 00812

Endodermal Enrico

sinus (yolk sac) tumor of the parotid gland: a case report

Viva a, Faust0 Zorzi b, Giacomo Annibale Carla Baronchelli b and Maria Fausta a Department of Maxilla-Surgery,

‘, Stefania Bonetti b

Stefini

‘,

and b 1st Department of Pathology, Spedali Civili Brescia, and ’ Otorhinolaryngoiatric Section, Children’s Hospital Umberto I”, Brescia (Italy)

(Received 25 June 1991) (Revised version received 23 December 1991) (Accepted 24 December 1991)

Key words: Endodermal sinus tumor; Yolk sac tumor; Malignant salivary gland tumor

Abstract

Malignant salivary gland neoplasms in children are rare, most common being mucoepidermoid carcinoma, adenoid cystic carcinoma, acinic cell carcinoma and adenocarcinoma. Most germ-cell neoplasms of head and neck in children are teratomas. The authors report a case of endodermal sinus tumor (EST) of the parotid gland in a 2-year-old girl, which recurred after chemotherapy. The role of a-fetoprotein LWP) serum level as a helpful marker in differential diagnosis and in evaluating tumor progression is underlined.

Introduction

Malignant salivary gland neoplasms in children are rare [1,5,7]. They are reported in newborns and during the first year of life [15,20], but they are usually described in older children [3,16,27]. If vascular tumors are excluded, nearly 50% of all salivary gland neoplasms in children are malignant, with a frequency that is 2.5 time higher than in adults. The most common histological types are mucoepidermoid carcinoma, adenoid cystic carcinoma, acinic cell carcinoma and adenocarcinema [ll]. Tumors derived from organ rudiments are extremely rare in salivary glands [13,27,30]. One case of ‘embryonal carcinoma’ of the parotid gland was Correspondence

to: Dr. Enrico Viva, via Garzetta 28, 25060 Brescia, Italy.

270

Fig. 1. Neoformation

of the right parotid gland characterized by quick evolutions, covered by ealthy cutis. There is no paralysis of the facial nerve.

described by Donath in a lZyear-old boy, after reviewing a series of 2876 salivary gland tumors [91. Approximately 5% of all germinal cell neoplasms in children appear in the soft tissues of the head and neck [S]. In this topographic site they are principally teratomas, displaying a spectrum of tissue type and maturation; a proportion contains elements of endodermal sinus tumor (EST) either in pure form or admixed with teratomatous tumors. The authors report a case of endoderma1 sinus tumor arising in the parotid gland of a 2-year-old girl.

Case report

A 2-year-old girl presented with a painful lump on the right cheek dating from 1 month (Fig. 1). The lesion rapidly increased in volume and fever appeared. Ultrasonography and TC scan showed a large, 6 x 4 cm, quite defined mass in the right parotid region (Fig. 2). A total right parotidectomy with homolateral jugo-digastric lymphadenectomy and preservation of the facial nerve was performed. The high friabiiity of the tumor and the lack of a true capsule did not allow radical surgery. Intraoperative histology showed an unusual papillary adenocarcinoma. A cycle of radiotherapy was started; however, it was stopped at a dose of 2100 rads

Fig. 2. CT shows a voluminous

mass of the right parotid gland. Its structure contours are not cleary irregular.

is dishomogeneous

and the

due to the renewal of tumoral growth. Later, serum cy-fetoprotein (AFP) determination revealed a high level of the protein (83000 ng/ml>, while carcinoma embryonic antigen (CEA) and human chorionic gonadotropin (HCG) were normal. A final histological diagnosis of EST was suggested. In the meanwhile the girl went to the Institute Gustave Roussy for consultant hospitalization. A recurrence appeared in the original site and a chest X-ray revealed small nodules spread over both pulmonary fields. At this Institution chemotherapy was tried using the protocol ‘Teratome’. After an initial remission with neoplastic mass reduction, disappearance of the pulmonary nodules and a fall in AFP levels (12 ng/ml), starting from the seventh month of therapy, the tumor relapsed, accompanied by increasing AFP levels. The girl died from neoplastic progression 18 months after the therapy was started. An autopsy was not performed. Pathological specimens consisted of about 10 cc of friable, red-yellowish tissue fragments, 2 periparotid and 1 jugo-digastric lymph nodes. On histology the tumor showed a prevalent reticular pattern, characterized by an intercommunicating labyrinth of small glandular spaces. Somewhere else the tumor contained microcystic spaces with some papillary structure lined by neoplastic cells (Fig. 3). PAS-positive, diastase-resistant, intracellular and extracellular globules were present. In a few places ductal structures resembling residual salivary gland excretory ducts were recognized mingled within the neoplastic proliferation. The jugo-digastric lymph

Fig. 3. Irregular-tubular

spaces and a large papillary structure lined by a monostrate of cuboidal cells.

node showed massive metastatic localization. Immunohistochemical analysis revealed a focal AFP positivity in some neoplastic cell, while CEA, a,-antitrypsin MAT) and HCG were completely negative.

Discussion ESTs are malignant germ-cell neoplasms. Their usual presentation is the testis and ovary. Extragonadal sites are rare, but well known. They have been described in anterior mediastinum [121, sacro-coccygeal region [lo], retroperitoneum and, less frequently, orbit [18,26], thymus [22], head and neck [8,171, liver [14,231, stomach [21], vulva and clitoris [29,4], vagina [61, cervix of the uterus [6], endometrium [24], urinary bladder [281, prostate [21 and pineal region. Salivary-gland localization of ESTs and other germ-cell neoplasms with extraembryonal differentiation seems so far unknown, even though teratomas have been described in the soft tissue of the head and neck. Differential diagnosis with adenocarcinoma should be considered in the absence of serum APP determination, especially when the more characteristic morphological patterns of EST are not prevalent. AFP serum level has been a marker of the neoplasm and also a clear indicator of the response to antiblastic therapy; a decreasing AFP level anticipates neoplastic mass reduction and the disappearance of pulmonary metas-

273

tases, whereas a new increase markes the neoplastic relapse. Like EST in gonadal and other extragonadal sites, the salivary gland localization also appears to be very aggressive, with a short survival time and a very short disease-free interval.

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Endodermal sinus (yolk sac) tumor of the parotid gland: a case report.

Malignant salivary gland neoplasms in children are rare, most common being mucoepidermoid carcinoma, adenoid cystic carcinoma, acinic cell carcinoma a...
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