Neurovascular compression of the greater occipital nerve: implications for migraine headaches.

BACKGROUND: Surgical release of the greater occipital nerve has been demonstrated to be clinically effective in eliminating or reducing chronic migraine symptoms. However, migraine symptoms in some patients continue after this procedure. It was theorized that a different relationship between the greater occipital nerve and occipital artery may exist in these patients that may be contributing to these outcomes. A cadaveric investigation was performed in an effort to further delineate the occipital artery-greater occipital nerve relationship. METHODS: Fifty sides of 25 fresh cadaveric posterior necks and scalps were dissected. The greater occipital nerve was identified within the subcutaneous tissue and its relationship with the occipital artery was delineated. A topographic map of the intersection of the two structures was created. RESULTS: The greater occipital nerve and occipital artery have an intimate relationship, and crossed each other in 27 hemiheads (54.0 percent). The relationship between these structures when they crossed varied from a single intersection to a helical intertwining. CONCLUSIONS: The greater occipital nerve and occipital artery have an anatomical intersection 54 percent of the time. There are two morphologic types of relationships between the structures: a single intersection point and a helical intertwining. Vascular pulsation may cause irritation of the nerve and is a possible explanation for migraine headaches that have the occipital region as a trigger point. Future imaging studies and clinical investigation is necessary to further examine the link between anatomy and clinical presentation.

The zygomaticotemporal branch of the trigeminal nerve: Part II. Anatomical variations.

BACKGROUND: Musculofascial and vascular entrapments of peripheral branches of the trigeminal nerve have been thought to be trigger points for migraine headaches. Surgical decompression of these sites has led to complete resolution in some patients. The zygomaticotemporal branch of the trigeminal nerve has been shown clinically to have sites of entrapment within the temporalis. A cadaveric study was undertaken to elucidate and delineate the location of this nerve's foramen and intramuscular course. METHODS: The periorbital and temporal regions of 50 fresh cadaveric hemiheads were dissected. The deep temporal fascia and lateral orbital wall were exposed through open dissection. The zygomaticotemporal nerve was located and followed through the temporalis muscle to its exit from the zygomatic bone. The muscular course was documented, and the nerve foramen was measured from anatomical landmarks. RESULTS: In exactly half of all specimens, the nerve had no intramuscular course (n = 25). In the other half, the nerve either had a brief intramuscular course (n = 11) or a long, tortuous route through the muscle (n = 14). The foramen was located at an average of 6.70 mm lateral to the lateral orbital rim and 7.88 mm cranial to the nasion-lateral orbital rim line, on the lateral wall of the zygomatic portion of the orbit. Two branches were sometimes seen. CONCLUSIONS: The zygomaticotemporal branch of the trigeminal nerve is a site for migraine genesis; surgical decompression or chemodenervation of the surrounding temporalis can aid in alleviating migraine headache symptoms. Advances in the understanding of the anatomy of this branch of the trigeminal nerve will aid in more effective surgical decompression.

Lower third nasal reconstruction: when is skin grafting an appropriate option?

BACKGROUND: A full-thickness skin graft is generally not considered the ideal replacement for the thick, sebaceous skin of the nasal tip, ala, lower sidewalls, or dorsum. Instead, many clinicians prefer to reconstruct these defects with local or axial composite flaps that incorporate skin, subcutaneous tissue, and fat. METHODS: The authors conducted a retrospective analysis of 55 consecutive patients who underwent reconstruction of lower third nasal defects with full-thickness skin grafts between 2002 and 2007 performed by the senior author (J.F.T.). All of the patients in this review underwent skin cancer ablation by means of Mohs' micrographic surgery. RESULTS: Good aesthetic results, based on preoperative and postoperative photographic analysis of contour and pigmentation, have been achieved in both the recipient and donor sites in 52 of 55 patients. Three patients, all of whom were smokers, experienced loss of the skin graft requiring alternative reconstructive techniques. CONCLUSIONS: Under certain conditions, skin grafting of defects of the caudal third of the nose offers a viable reconstructive option that yields good contour and color match. Careful analysis of defect size, location, and depth and consideration of donor-site skin thickness and pigmentation are vital for accurate replacement of the thick, pitted, sebaceous skin of the caudal nose. An evolution in technique has revealed that the forehead donor skin often provides a more consistent color and contour match in such reconstructions. Secondary dermabrasion of the graft provides a critical step for obtaining final aesthetic contour and color.