Skull base plasmacytoma with conductive hearing loss and an external auditory canal mass.

Skull base plasmacytomas are rare and difficult to differentiate clinically and radiologically from other tumors of the head and neck. Because of the risk of progression to multiple myeloma, early diagnosis is essential. We report the case of a 65-year-old woman who presented with left-sided conductive hearing loss and an external auditory canal mass.

Adaptive planning in intensity-modulated radiation therapy for head and neck cancers: single-institution experience and clinical implications.

Purpose: Anatomic changes and positional variability during intensity-modulated radiation therapy (IMRT) for head and neck cancer can lead to clinically significant dosimetric changes. We report our single-institution experience using an adaptive protocol and correlate these changes with anatomic and positional changes during treatment.

Methods And Materials: Twenty-three sequential head and neck IMRT patients underwent serial computed tomography (CT) scans during their radiation course.

Random positional variation among the skull, mandible, and cervical spine with treatment progression during head-and-neck radiotherapy.

Purpose: With 54 degrees of freedom from the skull to mandible to C7, ensuring adequate immobilization for head-and-neck radiotherapy (RT) is complex. We quantify variations in skull, mandible, and cervical spine movement between RT sessions.

Methods And Materials: Twenty-three sequential head-and-neck RT patients underwent serial computed tomography.