BACKGROUND Endometriosis is a relatively common disease among women with child-bearing potential, and rare before puberty or following menopause. It consists of the presence of hormone-responsive endometrium outside the endometrial cavity. CASE REPORT We report the case of a patient with a rectal lesion, initially approached as a primary rectal malignancy, where histopathology eventually reve...

Here, we report the case of a patient with a slowly-progressing anterior mediastinal teratoma submitted to surgical resection. The anatomopathological examination of the sample revealed malignant degeneration to carcinoid tumor. Such evolution is very rare, and we have found only three related studies in the literature. We describe the clinicopathological features of the tumor and discuss the t...

INTRODUCTION Although rare, the malignant degeneration of epidermoid cysts is well documented. Its occurrence with leptomeningeal dissemination and malignant cells in CSF is scarce. To the best of our knowledge only four cases have been reported. CASE REPORT The authors report the case of malignant transformation of an epidermoid cyst with leptomeningeal carcinomatosis (which simulates asepti...

OBJECTIVE To present a case of squamous cell carcinoma developed on a thyroglossal duct cyst in an adult patient. Modalities of treatment and prevention are discussed. PATIENT AND METHODS A 55-year-old woman had a thyroglossal duct cyst since childhood. Surgical resection had not been performed because of parental refusal. RESULTS Diagnosis of malignant degeneration was suggested by an incr...

OBJECTIVE To report an unusual case of malignant degeneration in a ganglioneuroma of the jugular foramen post stereotactic radiosurgery as well as to systematically review the pertinent literature involving radiosurgery associated malignancies. BACKGROUND Ganglioneuromas are uncommon lesions of the peripheral nervous system and infrequently reported in the head and neck region. There have bee...