The hair loss to the lower back half of my head was caused by the radiation, but only where the radiation hit. I had IMRT in 7 positions around my head & neck. The final position was to the back of my head, from under the table.

I've never heard of Cisplatin causing hair loss to only the lower back half of the head, that wouldn't make any sense.

dx 2/13/06. modified radical neck dissection 3/9/06 multiple biopsies of upper airway and direct laryngoscopy. 1 of 47 lymph nodes positive for metastatic undifferentiated carcinoma (lymphoepithelioma). Unknown primary. Finished radiation 5/24/06.