title: Analysis of orbital malignancies presenting in a tertiary care hospital in Pakistan.
abstract: OBJECTIVE
  To determine the frequencies of various orbital malignancies amongst orbital lesions in patients presenting in a tertiary care hospital in Pakistan.
  
  
  METHODS
  A retrospective analysis of 666 orbital cases with an established histopathological diagnosis of malignant tumors treated in Mayo Hospital Lahore from 1996 to 2015 (20 years).
  
  
  RESULTS
  About 66% of the malignant tumors were primary, 25% secondary, 8% haematopoietic and 1% metastatic. Almost 50% of the cases were children. Retinoblastoma is the commonest tumor (43% overall and 87% among children). Squamous cell carcinoma is the second commonest (15.6% overall and 31% among adults). These are then followed by Adenoid cystic carcinoma of Lacrimal Gland (9%), Lymphoma/Leukaemia (8%) and Rhabdomyosarcoma (6.3%).
  
  
  CONCLUSIONS
  Frequencies of various orbital malignancies show geographical variation in both paediatric and adult population.
authors.affiliation: Prof. Dr. Asad Aslam Khan, MS (Ophth), PhD (Ophth). Institute of Ophthalmology/College of Ophthalmology and Allied Vision Sciences, King Edward Medical University, Mayo Hospital, Lahore, Pakistan.
authors.forename: Asad Aslam
authors.initials: AA
authors.lastname: Khan
authors.affiliation: Dr. Suhail Sarwar, MS Ophthalmology. Institute of Ophthalmology/College of Ophthalmology and Allied Vision Sciences, King Edward Medical University, Mayo Hospital, Lahore, Pakistan.
authors.forename: Suhail
authors.initials: S
authors.lastname: Sarwar
authors.affiliation: Dr. Mohammad Ali A Sadiq, FCPS Ophthalmology, FPOS (UK), FAAPOS (USA). Institute of Ophthalmology/College of Ophthalmology and Allied Vision Sciences, King Edward Medical University, Mayo Hospital, Lahore, Pakistan.
authors.forename: Mohammad Ali A
authors.initials: MA
authors.lastname: Sadiq
authors.affiliation: Dr. Imran Ahmad, DOMS, MPH. Institute of Ophthalmology/College of Ophthalmology and Allied Vision Sciences, King Edward Medical University, Mayo Hospital, Lahore, Pakistan.
authors.forename: Imran
authors.initials: I
authors.lastname: Ahmad
authors.affiliation: Dr. Nayab Tariq, MBBS. Institute of Ophthalmology/College of Ophthalmology and Allied Vision Sciences, King Edward Medical University, Mayo Hospital, Lahore, Pakistan.
authors.forename: Nayab
authors.initials: N
authors.lastname: Tariq
authors.affiliation: Dr. Sibghat-ul-Noor, MBBS. Institute of Ophthalmology/College of Ophthalmology and Allied Vision Sciences, King Edward Medical University, Mayo Hospital, Lahore, Pakistan.
authors.lastname: Sibghat-Ul-Noor
keywords: Lymphoma; Malignancy; Orbit; Retinoblastoma; Rhabdomyosarcoma; Squamous cell carcinoma