Patient Portal. SHARE + Select Your Location: All. ... Main Line Endoscopy Center - East 333 East City Ave, 2 Bala Plaza Suite IL 30 Bala Cynwyd, PA 19004 610-660-8470. office details. patient portal. Main Line Endoscopy Center - West 325 Central Ave Lower Level Malvern, PA 19355 610-644-7274..