**Question:** In the cut section of ovary given below which is the ovarian tumour:

A. Granulosa cell tumor
B. Theca cell tumor
C. Sertoli cell tumor
D. Oligo-ovarian cyst

**Core Concept:** Ovarian tumours are categorized into benign, borderline, and malignant. They are classified based on cell types, histopathology, and clinical features.

**Why the Correct Answer is Right:**

A granulosa cell tumor is a benign, slow-growing, and often hormonally active tumour. It arises from the granulosa cells of the theca layer and is typically seen in postmenopausal women. The presence of mitotic figures and cellular atypia helps in differentiating it from other types of ovarian tumours.

B. Theca cell tumor is another benign, hormonally active tumor that develops from the theca cells of the theca layer. These tumors typically present in reproductive-age women and are characterized by the presence of luteinized cells, which contain large amounts of lipids and glycogen.

C. Sertoli cell tumor is a rare, benign, and mostly asymptomatic tumor that develops from the Sertoli cells of the seminiferous tubules. These tumors are typically seen in prepubertal males and are characterized by the presence of Sertoli cells, which are responsible for spermatogenesis.

D. Oligo-ovarian cyst is a benign condition characterized by the presence of a single or few ovarian follicles and a thin capsule. It is often confused with a tumor due to its cystic appearance, but it is a non-neoplastic condition.

**Why Each Wrong Option is Incorrect:**

Option B is incorrect because theca cell tumors are more commonly associated with the ovaries and are characterized by the presence of luteinized cells, while the given image is of an ovarian tumor.

Option C is incorrect because Sertoli cell tumors are predominantly seen in prepubertal males and are not typically found in females.

Option D is incorrect as it is a non-neoplastic condition and does not involve the cell types mentioned in the options A and B.

**Clinical Pearls:**

1. Atypical presentations of ovarian tumors, such as hormonal disturbances, can mimic other conditions like polycystic ovary syndrome (PCOS) or endometriosis.
2. In cases of suspected ovarian tumors, thorough clinical examination, imaging studies, and serum hormonal assays should be performed to confirm the diagnosis and assess the clinical relevance.
3. In some cases, laparoscopic or laparotomic exploration may be required for definitive diagnosis and staging.