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Background: Diagnosing ovarian tumors in dogs can be challenging since the clinical symptoms are often generic. The present case report underscores a rare case in which a suspected unilateral ovarian tumor in a dog was initially identified using ultrasonography and subsequently confirmed to be a luteoma through postoperative histopathology. Case Description: An 8-year and 6-month-old female Maltese dog presented with a 10-day history of vulvovaginal bleeding, hematuria, and decreased appetite. Physical examination revealed only vaginal bleeding, with no other abnormalities. Laboratory examinations showed no abnormalities, while abdominal radiography revealed the presence of cystic calculi as the sole abnormality. Abdominal ultrasound revealed an enlarged right ovary with regular contour and echogenicity, featuring unusual cystic components surrounding the right ovarian parenchyma. Furthermore, irregular thickening with multiple cystic lesions was observed in the endometrial wall of the bilateral uterine horns, indicative of cystic endometrial hyperplasia. Ultrasonographic findings suggested unilateral right ovarian disease. During ovariohysterectomy, the right ovary was slightly larger than the left ovary and adhered to the surrounding mesenteric fat layer and right pancreatic parenchyma. Histopathological examination confirmed the diagnosis of luteoma in the right ovary. Three days after surgery, the patient's clinical signs exhibited complete improvement, with return of normal appetite. Conclusion: This case report highlights a rare diagnosis of unilateral ovarian luteoma based on mild ultrasonographic abnormalities, which was ultimately confirmed on histopathological examination. [Open Vet J 2024; 14(3.000): 930-936]

Adnexal masses are identified in pregnant patients at a rate of 2 to 20 in 1000, approximately 2 to 20 times more frequently than in the age-matched general population. The most common types of adnexal masses in pregnancy requiring surgical management are dermoid cysts (32%), endometriomas (15%), functional cysts (12%), serous cystadenomas (11%), and mucinous cystadenomas (8%). Approximately 2% of adnexal masses in pregnancy are malignant. While most adnexal masses in pregnancy can be safely observed and around 70% spontaneously resolve, a minority warrant surgical intervention due to symptoms, risk of torsion, or suspicion for malignancy. Ultrasound is the mainstay of evaluation of adnexal masses in pregnancy due to accuracy, safety, and availability. Several ultrasound mass scoring systems, including the Sassone, Lerner, International Ovarian Tumor Analysis (IOTA) Simple Rules, and IOTA Assessment of Different NEoplasias in the adneXa (ADNEX) scoring systems have been validated specifically in pregnant populations. Decisions regarding expectant versus surgical management of adnexal masses in pregnancy must balance the risks of torsion or malignancy with the likelihood of spontaneous resolution and the risks of surgery. Laparoscopic surgery is preferred over open surgery when possible due to consistently demonstrated shorter hospital length of stay and less post-operative pain, as well as some data demonstrating shorter operative time, lower blood loss, and lower risks of fetal loss, pre-term birth, and low birth weight. Best practices for laparoscopic surgery during pregnancy include left lateral decubitus positioning after the first trimester, port placement with respect to uterine size and pathology location, insufflation pressure of less than 12-15 mm Hg, intraoperative maternal capnography, pre- and post-operative fetal heart rate and contraction monitoring, and appropriate mechanical and chemical thromboprophylaxis. While planning surgery for the second trimester generally affords time for mass resolution while optimizing visualization with regards to uterine size and pathology location, necessary surgery should not be delayed due to gestational age. When performed at a facility with appropriate obstetric, anesthetic, and neonatal support, adnexal surgery in pregnancy generally results in excellent outcomes for mother and fetus. [ABSTRACT FROM AUTHOR]

Mature cystic teratomas are the most common ovarian tumors in women of reproductive age. The malignant transformation of mature cystic teratomas is a rare entity. The most common malignant tumor in mature cystic teratomas is squamous cell carcinoma, whereas papillary thyroid carcinoma is an exceptional event. On the other hand, stromal luteoma is an uncommon benign steroid cell tumor of the ovary that occurs mostly in postmenopausal females. The coexistence of different ovarian tumor subtypes is an extremely rare pathological event. In this report, we describe a case of papillary thyroid carcinoma arising in mature cystic teratomas coexisting with stromal luteoma. To the best of our knowledge, this is the first report in English literature. Both mature cystic teratoma (with papillary thyroid carcinoma) and stromal luteoma are very rare entities. Pathologists should be aware of malignant transformation and exclude it when investigating mature cystic teratomas, especially in older patients. [ABSTRACT FROM AUTHOR]

Pregnancy luteomas are rare, nonmalignant lesions thought to be caused by hormonal changes during pregnancy. Granulosa cell tumor is a rare type of ovarian cancer; 10% occur during pregnancy and typically present with elevated inhibin levels. Herein, we present a case of a pregnant female with a pelvic mass and elevated inhibin B suggestive of a granulosa cell tumor, yet with final pathology consistent with a pregnancy luteoma.

The aim of this study was to describe a case of ovarian torsion necrosis due to delayed treatment of luteoma in a woman with IVF twin pregnancy who was misdiagnosed with acute appendicitis. We summarized the clinical manifestations and diagnosis of luteoma in a woman with IVF twin pregnancy and reviewed the relevant literature. We report the case of a 34-year-old Asian female who became pregnant through in vitro fertilization (IVF) and had acute right underbelly pain at 26 weeks and 6 days of gestation, which was misdiagnosed as acute appendicitis. Written consent was obtained from the patient. After fasting for a short duration and receiving anti-inflammatory and intravenous fluid replacement treatment after admission, the woman experienced increased right lower abdominal pain without relief and decreased fetal movement. B-ultrasound and CT examination showed that luteoma torsion was possible, and we performed emergency surgical laparotomy. During the operation, it was found that the right ovary was enlarged, the fallopian tube was twisted 720 degrees, and there was no lesion in the appendix. The right necrotic ovary was removed, and pathological results showed a hemorrhagic corpus luteum in the right ovary. The patient's abdominal pain was relieved after the operation and the pregnancy was continued. This is a typical case of ovariectomy associated with a luteoma of pregnancy. Whether in vitro fertilization and related procedures increase the risk of luteoma and whether they increase the risk of ovarian torsion necrosis in the case of luteoma formation are questions that need further study. [ABSTRACT FROM AUTHOR]

Pregnancy luteoma (PL) is a rare, non-neoplastic ovarian lesion that can mimic malignant ovarian tumors, posing significant diagnostic challenges. PL typically presents as asymptomatic, unilateral, or bilateral ovarian masses and is often discovered incidentally. Its development is linked to hormonal fluctuations during pregnancy, particularly elevated human chorionic gonadotropin (hCG) levels. While PL generally resolves postpartum, complications such as torsion may necessitate surgical intervention. We report the case of a 23-year-old primigravida presenting with acute abdominal pain, vomiting, and abdominal distention at 13 weeks gestation. Imaging revealed large, bilateral multicystic ovarian masses. Elevated CA-125 levels raised suspicion for malignancy, leading to a laparotomy and bilateral oophorectomy. Histopathological analysis confirmed the diagnosis of pregnancy luteoma., Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Nawaz et al.)

Summary: A 15‐year‐old Paint mare (Case 1) and a 15‐year‐old Arabian mare (Case 2) were presented for aggressive and undesired behaviour. Reproductive evaluation revealed, initially, an enlarged ovary with a smaller/normal sized contralateral ovary in each case. Granulosa cell tumour (GCT) panel testing revealed elevated inhibin B in both cases and elevated anti‐Mullerian hormone (AMH) levels only in Case 1 determined from currently established reference ranges. Based on a presumptive diagnosis of GCT, bilateral standing ovariectomy was elected for both mares. In each case neoplastic tissue consistent with luteoma was detected only on histological examination in the smaller/normal sized left ovary; the right ovary appearing normal. Long‐term follow‐up was performed 1 year and 5 years post‐operatively by telephone. The owners were satisfied with the outcome and each patient demonstrated resolution of aggressive stallion‐like behaviour. Each case returned to the owners' intended use. In conclusion, luteoma should be considered as a differential diagnosis for ovarian neoplasms in horses related to behavioural abnormalities, even in normal‐sized ovaries. [ABSTRACT FROM AUTHOR]

Luteoma is a benign ovarian neoplasm, usually incidentally found during pregnancy. It can produce androgenic hormones. Most cases are asymptomatic, while a few present with maternal and/or neonatal virilization. Its etiology is still unclear and may relate to human chorionic gonadotropin (hCG) stimulation. Pregnancy luteoma will resolve spontaneously after childbirth. The early recognition and prompt diagnosis can save the ovary from unnecessary surgery. [ABSTRACT FROM AUTHOR]

Abstract Background This is the first report about a vaginal leiomyoma concomitant with an ovarian luteoma in a bitch. Case presentation A 11-year-old intact female Labrador retriever was referred because of anuria, constipation and protrusion of a vaginal mass through the vulvar commissure. The bitch had high serum progesterone concentration (4.94 ng/ml). Because of the possibility of progesterone responsiveness causing further increase of the vaginal mass and since the bitch was a poor surgical candidate a 10 mg/kg aglepristone treatment was started SC on referral day 1. A computerized tomography showed a 12.7 × 6.5 × 8.3 cm mass causing urethral and rectal compression, ureteral dilation and hydronephrosis. A vaginal leiomyoma was diagnosed on histology. As serum progesterone concentration kept increasing despite aglepristone treatment, a 0.02 ng/mL twice daily IM alfaprostol treatment was started on day 18. As neither treatment showed remission of clinical signs or luteolysis, ovariohysterectomy was performed on referral day 35. Multiple corpora lutea were found on both ovaries. On histology a luteoma was diagnosed on the left ovary. P4 levels were undetectable 7 days after surgery. Recovery was uneventful and 12 weeks after surgery tomography showed a reduction of 86.7% of the vaginal mass. The bitch has been in good health and able to urinate without any complication ever since. Conclusions This case demonstrates the importance of identifying progesterone related conditions as well as the importance of judiciously using a combined medical and surgical approach.

Background: Diagnosing ovarian tumors in dogs can be challenging since the clinical symptoms are often generic. The present case report underscores a rare case in which a suspected unilateral ovarian tumor in a dog was initially identified using ultrasonography and subsequently confirmed to be a luteoma through postoperative histopathology., Case Description: An 8-year and 6-month-old female Maltese dog presented with a 10-day history of vulvovaginal bleeding, hematuria, and decreased appetite. Physical examination revealed only vaginal bleeding, with no other abnormalities. Laboratory examinations showed no abnormalities, while abdominal radiography revealed the presence of cystic calculi as the sole abnormality. Abdominal ultrasound revealed an enlarged right ovary with regular contour and echogenicity, featuring unusual cystic components surrounding the right ovarian parenchyma. Furthermore, irregular thickening with multiple cystic lesions was observed in the endometrial wall of the bilateral uterine horns, indicative of cystic endometrial hyperplasia. Ultrasonographic findings suggested unilateral right ovarian disease. During ovariohysterectomy, the right ovary was slightly larger than the left ovary and adhered to the surrounding mesenteric fat layer and right pancreatic parenchyma. Histopathological examination confirmed the diagnosis of luteoma in the right ovary. Three days after surgery, the patient's clinical signs exhibited complete improvement, with the return of normal appetite., Conclusion: This case report highlights a rare diagnosis of unilateral ovarian luteoma based on mild ultrasonographic abnormalities, which was ultimately confirmed on histopathological examination., Competing Interests: The authors declare that there is no conflict of interest.

Abstract Background Maternal virilization during pregnancy is a rare phenomenon. Polycystic ovary syndrome (PCOS), luteoma and luteinic cysts are the most frequent and benign etiologies. This article presents two cases of recurrent maternal virilization during pregnancy. Clinical cases Our reported cases were young women with Afro-Caribbean and Nigerian origins. Data were collected by history-taking, clinical examination, laboratory investigations, transabdominal ultrasonographic examination and Magnetic Resonance Imaging. Both patients were diagnosed with PCOS according to the Rotterdam criteria. During each of their pregnancies they both developed an explosive hirsutism, a deepening in the voice, a clitoromegaly. Gestational diabetes occurred during pregnancies. There was no fetal virilization, despite raising androgen levels, more than tenfold to normal. Improvement of hirsutism and normalization of androgens were described in postpartum. Conclusion Only few cases of maternal virilization during pregnancy were reported in literature and even fewer concern recurrent and bilateral ovarian etiology. Hyperplasia of ovarian theca cells seems to be the most likely explanation, which would suggest that PCOS belongs to a spectrum of abnormal reactivity of the ovary to human Chorionic Gonadotrophin (hCG) stimulation along with luteoma and luteinic cyst of pregnancy. Insulin resistance could worsen hyperandrogenism but is not enough to explain virilization. Treatment should focus on protecting the fetus of possible virilization as well as its mother, but also on preserving the subsequent fertility in both.

Background: This is the first report about a vaginal leiomyoma concomitant with an ovarian luteoma in a bitch. Case presentation: A 11-year-old intact female Labrador retriever was referred because of anuria, constipation and protrusion of a vaginal mass through the vulvar commissure. The bitch had high serum progesterone concentration (4.94 ng/ml). Because of the possibility of progesterone responsiveness causing further increase of the vaginal mass and since the bitch was a poor surgical candidate a 10 mg/kg aglepristone treatment was started SC on referral day 1. A computerized tomography showed a 12.7 × 6.5 × 8.3 cm mass causing urethral and rectal compression, ureteral dilation and hydronephrosis. A vaginal leiomyoma was diagnosed on histology. As serum progesterone concentration kept increasing despite aglepristone treatment, a 0.02 ng/mL twice daily IM alfaprostol treatment was started on day 18. As neither treatment showed remission of clinical signs or luteolysis, ovariohysterectomy was performed on referral day 35. Multiple corpora lutea were found on both ovaries. On histology a luteoma was diagnosed on the left ovary. P4 levels were undetectable 7 days after surgery. Recovery was uneventful and 12 weeks after surgery tomography showed a reduction of 86.7% of the vaginal mass. The bitch has been in good health and able to urinate without any complication ever since. Conclusions: This case demonstrates the importance of identifying progesterone related conditions as well as the importance of judiciously using a combined medical and surgical approach. [ABSTRACT FROM AUTHOR]

A luteoma is a benign ovarian mass that can have malignant characteristics on sonography. Pelvic sonography is used to help distinguish benign from malignant masses. The workup of adnexal masses during pregnancy may involve the use of both transabdominal and transvaginal sonography as well as Doppler imaging, magnetic resonance imaging, and serum tumor markers to identify the risk of malignancy. This study presents a case of a benign ovarian luteoma of pregnancy detected during sonography. The mass was removed during the first trimester due to malignant sonographic features. Counseling and treatment regarding ovarian masses should consist of a multidisciplinary team made up of physicians in maternal-fetal medicine, radiology, neonatology, and sonographers. [ABSTRACT FROM AUTHOR]

A white, lobular mass was found in the right ovary of a pregnant Risso's dolphin (Grampus griseus) at necropsy. The mass was unilateral and occupied most of the pre-existing ovarian tissue. Histologically, the mass was composed of diffuse sheets of polyhedral cells with abundant eosinophilic cytoplasm and oval nuclei, separated by fibrous connective tissue. Only a few ovarian follicles were observed at the periphery of the mass. Immunohistochemically, the large eosinophilic cells were positive for vimentin and negative for pan-cytokeratins. Based on the histopathological features, the present case was diagnosed as luteoma. In human medicine, luteoma of pregnancy, a tumor-like proliferative lesion occurring in pregnant women, is well described. In veterinary medicine, luteoma associated with pregnancy has never been described. The present study would provide useful information for understanding the characteristics of luteoma in animals. [ABSTRACT FROM AUTHOR]

In this case, ovarial luteoma in the left ovary in a 13-year-old Terrier was defined both macroscopically and microscopically. The dog had a history of vomiting and anorexia for a week. In palpation, sensitivity observed on the left abdominal region of the animal. Ultrasonographically a hypoechoic, round mass with homogeny architecture, 13 x 11 cm in size, located in the left abdominal region was found. The both ovary with tumoural mass and uterus were taken by operation and masses were referred to pathology laboratory for histopathological examination. Macroscopically, the left ovarial mass, 13 x 11 x 8 cm in size, was moderately firm, round, multilobulated and encapsulated and the cut surface had a yellowish appearance. There were focal areas of hemorrhages and necrosis. In microscopical examination, neoplastic cells were arranged in irregular shaped solid sheet. The nuclei were small, round to oval and had coarsely stippled chromatin. The amount of cytoplasm varied from scant to moderate and was faintly eosinophilic and finely granular or vacuolated. Luteinized cells had prominent eosinophilic cytoplasm and pale staining nuclei. Few mitotic figures were seen in the sections. The left ovary was completely invaded by neoplastic cells and the normal histological architecture was not observed. However in the right ovary and uterus was not found pathological lesion by histological examination. In the light of the macroscopical and microscopical findings the tumour was found compatible with ovarial luteo-ma. [ABSTRACT FROM AUTHOR]

Pregnancy luteoma is a non-neoplastic lesion of the ovary occurring during pregnancy and is usually discovered incidentally at the time of a cesarean section or during postpartum tubal ligation. An accurate diagnosis is important for the mother and the fetus as it can be confused with ovarian malignancy leading to unnecessary surgery. We report a case of a pregnant female who was discovered to have bilateral enlarged ovaries at the time of emergency cesarean section.

The article presents a case study of an 11-year-old ovariectomized bitch with a rare case of benign sex cord-stromal tumor consisted largely of luteoma with minor portion of Sertoli cell tumor found at the left ovary excision. The authors mention that granulosa cell component was lacking. They found that Wilms' tumor-1 (WT1)-expression pattern suggested the difference in the phenotype of the cell types.

Abstract: In order to study the physiology and pathophysiology of gonadotrophin action, we have produced transgenic (TG) mice overexpressing human chorionic gonadotrophin (hCG) α and β subunits (hCG+ mice) and knockout (KO) mice for the luteinising hormone receptor (LHR; LuRKO mice). The two extremes in LH function, i.e. strong LH/hCG stimulation and total blockade of this action, confirm numerous earlier concepts about LH function, but they also reveal new aspects about gonadal function during excessive LH production and in the absence of this trophic stimulus. The purpose of this review is to summarise the key findings on these two genetically modified mouse models. [Copyright &y& Elsevier]

A mass was identified on the left caudal region of the abdomen in a 13-year-old bonnet monkey ( Macaca radiata). The mass was excised and diagnosed as granulosa theca cell tumor accompanied with luteoma based on the microscopic findings. Morphologically it appeared pink, round, firm multilobulated measured approximately 5 × 3 × 2.5 cm in dimension. Histologically the luteoma composed of polyhedral cells with pale strained vacuolated cytoplasm, centrally located nuclei with distinct cytoplasmic borders. Granulosa theca cell tumor appeared as densely packed spindle shaped fusiform cells arranged in interlacing bundles and whorled pattern with neoplastic cells appearing irregular shaped solid sheets. The concomitant development of granulosa theca cell tumor with luteoma in a single ovary is very rare and is the first reported case in a bonnet macaque to our knowledge. [ABSTRACT FROM AUTHOR]

Abstract: We have produced transgenic (TG) mice expressing under the ubiquitin C promoter either the glycoprotein hormone common α-subunit (Cα) or human chorionic gonadotropin (hCG) β-subunit. Cα overexpression alone had no phenotypic effect, but the hCGβ expressing females, presenting with moderately elevated levels of bioactive LH/hCG, due to dimerization of the TG hCGβ with endogenous Cα, developed multiple gonadal and extragonadal neoplasias. Crosses of the Cα and hCGβ mice (hCGαβ) had >1000-fold elevated hCG levels, due to ubiquitous transgene expression, and presented with more aggressive tumour formation. The ovaries displayed initially strong luteinisation of all somatic cell types, leading to formation of luteomas, and subsequently to germ cell tumours (teratomas). The pituitary glands of TG females were massively enlarged, up to >100mg, developing macroprolactinomas with very high prolactin (PRL) production. This endocrine response probably induced breast cancers in the mice. In contrast to the females, similar high levels of hCG in male mice had only marginal effects in adulthood, with slight Leydig cell hyperplasia and atrophy in the seminiferous epithelium. However, clear Leydig cell adenomas were observed in postnatal mice, apparently originating from fetal Leydig cells. In conclusion, these studies demonstrate marked tumorigenic effects of supraphysiological hCG levels in female mice, but clear resistance to similar changes in males. The extragonadal tumours were induced by hCG stimulated aberrant ovarian endocrine function, rather than by direct hCG action, because gonadectomy prevented all extragonadal phenotypes despite persistent hCG elevation. The phenotypes of the TG mice apparently represent exaggerated responses to hCG/LH and/or gonadal steroids. It remains to be explored to what extent they simulate respective responses in humans to pathophysiological elevation of the same hormones. [Copyright &y& Elsevier]

In the present study, a rare case of ovarian luteoma is described in a 5-year-old German Shepherd dog. Histopathologically, the tissue sections composed of multiple lobules of polyhedral cells with abundant, finely vacuolated cytoplasm, centrally located nuclei surrounded by fine well-vascularized connective tissue. Neoplastic cells showed strong cytoplasmic positivity for inhibin-α and vimentin and moderate for calretinin. Based on histopathological and immunohistochemical findings, the tumor was diagnosed as ovarian luteoma. [ABSTRACT FROM AUTHOR]