A child presents with gelastic seizures, precious puberty. MRI shows small pedunculated mass attached to tuber cinerum. What is the diagnosis?: (A) MC cune albright syndrome, (B) Kallman syndrome, (C) Hypothalamic hamartoma, (D) Prader willi syndrome
Answer is C. Hypothalamic hamartoma :

Most common brain lesion causing central precocious puberty.
Consists of ectopically located neural tissue.
May be associated with gelastic seizures (laughing spells).
MRI - small pedunculated mass attached to cinerum or floor of 3rd ventiricle.