are by far the most common persistent adnexal masses found in pregnancy .
Prevalence of transformation to multiple distinct histologies in metastases is unknown, with only two reports that included mature and immature teratoma, embryonal rhabdomyosarcoma, and non-Hodgkin's lymphoma components  and mature teratoma
, choriocarcinoma, and embryonal carcinoma, respectively .
Shariff, "Mature teratoma
of the nasal vestibule: a case report," Ear, Nose, and Throat Journal, vol.
Pathological examination of the mass revealed mature teratoma
with cystic structures lined by stratified squamous epithelium and at places cartilage, respiratory epithelium, pancreatic epithelium, urothelial epithelium, mucous secreting glands, muscle fibers, and epidermal cyst (Figures 6 and 7).
26% of mature teratomas
contain calcified elements.
The histopathological examination of the mass revealed "mature teratoma
" (Figure 3).
KEY WORDS: Ovarian neoplasms; Teratomas; Mature teratoma
; Benign teratoma; Cystic teratoma.
Incomplete resection of a neonatal, mature teratoma
has been reported to recur in adulthood as adenocarcinoma.
Histopathological diagnosis was serous cystadenofibroma in one patient and mature teratoma
Histopathology of this mass revealed no viable tumour but mature teratoma
elements were seen.
Two recurrences with 2 cycles of BEP or PVB and 1 with 3 cycles of BEP were pure mature teratoma
. In the randomized trial by Albers and colleagues, one course BEP versus RPLND, the two-year recurrence-free survival was 99.46%.[sup.65] The results of the studies are summarized in Table 7.[sup.65,71,74]-[sup.81]
(15) Embryonal carcinoma, the most undifferentiated, showed the highest level of expression of telomerase RNA, whereas telomerase expression was decreased in mature teratoma