Panicker, J NJothy Dev, KSandhyamani, SMadhusudanan, SUnnikrishnan, MArjun, PDash, P K2001-05-222009-05-302001-05-222009-05-302001-05-22Panicker JN, Jothy Dev K, Sandhyamani S, Madhusudanan S, Unnikrishnan M, Arjun P, Dash PK. Teratoma masquerading as catamenial pleural effusion. Journal of the Association of Physicians of India. 2001 May; 49(): 576-8http://imsear.searo.who.int/handle/123456789/85886Pleural effusion is a common clinical entity in medical practice. We report a case wherein extensive investigations failed to yield a diagnosis and medical management including repeated thoracocentesis left the effusion refractory. The patient, a 26 years lady, gave a definite history of catamenial dry cough and wheeze. The mystery was unraveled following exploratory thoracotomy when a giant mediastinal teratomatous cyst with luteinized ovarian tissue was discovered and removed, leading to eventual cure for the patient.engAdultDiagnosis, DifferentialFemaleHumansMediastinal Neoplasms --complicationsPleural Effusion --etiologyTeratoma --complicationsTomography, X-Ray ComputedCase Reports