Malignant struma ovarii mimic clear cell carcinoma.
BACKGROUND
Struma ovarii are quite unusual lesions that represent less than 3% of all teratomas and its malignant transformation is very uncommon. The clinical manifestations are characteristic of pelvic tumor and the hormonal metabolism is not usually modified. Radiography, employing ultrasound procedures, is the most commonly used pre-surgical detection method but only histological examination makes the diagnosis. The malignance recognition by pathological study not always is easy; in this sense, it requires an exhaustive sampling of the lesion, being specially carefully in some aspects related with malignant transformation such as extending beyond the capsula and involving peripheral tissues. A thyroidal differentiation must be confirmed by immunohistochemical study and other local processes with similar histology should be ruled out. Given the exceptional character of malignant forms, there does not appear to be unanimous agreement on a standard therapy with a somewhat uncertain prognosis.


METHODS
We show a case of a 22-year-old patient with an ovarian tumor that was discovered by ultrasound examination and surgically removed. The histologic study revealed struma ovarii with malignant transformation towards follicular carcinoma and unlike previously published cases, had a prevalence of clear cells. The patient was submitted to a second surgical staging intervention, with conservative surgery and follow-up controls being considered given that was a young woman with a desire to have children. Laparoscopy was employed as the best method capable to facilitate shorter convalescence.


RESULTS
Clinical and analytical controls, measuring thyroglobulin levels, has been satisfactory up to the present.
García
Angel
A
Department of Pathology, Hospital Vall d'Hebron, Universitat Autònoma de Barcelona, Passeig Vall d'Hebron 119-129, 08035 Barcelona, Spain. angarcia@cs.vhebron.es
Castellví
Josep
J
López
Miguel
M
Gil
Antonio
A
de la Torre
Javier
J
Ramón y Cajal
Santiago
S
D018262:Adenocarcinoma, Clear Cell / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D000328:Adult; D018959:CD57 Antigens; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D015260:Neprilysin; D010051:Ovarian Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D010052:Ovariectomy; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013330:Struma Ovarii / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D013954:Thyroglobulin / Q000097:blood; D014463:Ultrasonography
D018959:CD57 Antigens; D013954:Thyroglobulin; D015260:Neprilysin